The control center of a cell is nucleus
What is a nucleus?Nucleus is the structure in a cell that contains the chromosomes. The nucleus has a membrane around it, and is where RNA is made from the DNA in the chromosomes.
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus. The matrix in which the nuclear components are suspended is the nucleoplasm.
A cell cannot function without a nucleus. This is because nucleus controls almost every activity of the cell.
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What is the charge on an electron?
O-1
0
+1
O+2
Mark this and return
Save and Exit
Next
Answer:
0-1
Explanation:
An electron is a negatively charged subatomic particle, So -1 is the correct option.
What is usually released in a combustion reaction?
Answer:
heat energy
Explanation:
I think because of the collisions of all the atoms/molecules that were accelerated because of the heat from the initial reaction and first collisions, heat is generated.
also, oxygen is added to the flame from the air as well :)
diborane is a highly reactive oron hydraidw, which was once considered as a possible rocket fuel for the us space program. calculate the delta h for the symthesis of dibrone
The chemical compound diborane has the molecular formula B2H6 and is made up of boron and hydrogen atoms. Diborane is a highly reactive oron hydraidw, which was once a possible rocket fuel for the us space program
Boranes are the name given to compounds that contain both boron and hydrogen atoms. One of the most basic boron hydrides is diborane. Boron hydrides and air combine effectively to create explosive combinations. At normal temperature, this material will fire rapidly. Diborane also goes by the names boro ethane and diboron hexahydride.
At room temperature, pure diborane does not react with oxygen or air, but instead produces significant amounts of impure B2O3 and energy.
3O2 + B2H6 = 3O3 + 3H2O
H equals -2165 KJ mol-1.
Trimethyl Borate is produced when diborane and methyl alcohol combine.
6CH3OH + B2H6 = 2B(OCH3)3.
ΔH = -2165 KJ mol-1 – Diborane reacts with methyl alcohol to give trimethyl Borate. B2H6 + 6CH3OH → 2B (OCH3)3 + 6H2
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What is the difference, on a molecular level, between a gas, liquid, and solid
Write the balanced molecular
chemical equation for the reaction of chlorine gas bubbled through aqueous sodium iodide. If no reaction occurs, simply write only NR. Be sure to include the proper
phases for all species within the reaction.
Answer:
Explanation:
Expert-Verified Answer. The balanced reaction that describes the reaction of chlorine gas and sodium iodide to produce elemental iodine and sodium chloride in aqueous solution is expressed Cl2+2NaI= I2 + 2NaCl.
do the initial concentrations afect the equilibrium concentrations of reactants and products of a given reaction?
No, the initial concentrations affect the equilibrium concentrations of reactants and the products.
The equilibrium constant does not depend on the initial concentration of reactants but depends on concentration of various species at equilibrium .
The equilibrium constant is the ratio between the product of the molar concentrations of the products to that of the product of the molar concentrations of the reactants with each concentration term raised to a power equal to stoichiometric coefficient in the balanced chemical equation.
If you increase the concentration of a reactant or product participated in an equilibrium, the system will absorb some of the added material and after some time the system will re establish equilibrium. When you recalculate Keq, you get the same value.
It changes with the change in the temperature.
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How much energy is required to remove a proton from 157n ? the masses of the atoms 157n , 146c and 11h are 15. 000109 u , 14. 003242 u and 1. 007825 u , respectively.
The energy is required to remove a proton from ¹⁵N₇ is
The reaction to remove the proton is given as follows :
¹⁵N₇ ----> ¹⁴C₆ + H
The mass of ¹⁵N₇ = 15.000109
the mass of ¹⁴C₆ = 14.003242
The mass of H = 1.007825
The energy requires to remove a proton is given as:
E = ( 14.003242 + 1.007825 - 15.000109) u
E = 0.010958 × 9312.5 MeV
E = 10.2046375 MeV
Thus, energy is required to remove a proton from ¹⁵N₇ with the masses of the atoms ¹⁵N₇ , ¹⁴C₆ and H are 15.000109 u , 14.003242 u and 1.007825 u , respectively is 10.2046375 MeV.
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You add 100.0 g of water at 60.0 °C to 100.0 g of ice at 0.00 °C. Some of the ice melts and cools the water to 0.00 °C. When the ice and water mixture has come to a uniform temperature of 0 °C, how much ice has melted?
The melting ice weighs 50.3 grams. When the ice and water mixture has come to a uniform temperature of 0 °C.
Where is the mass of melted ice located?Subtracting the combined mass of the cup, water, and ice cubes from the combined mass of the cup, water, and ice cubes yields the mass of the ice cubes.
where,
q = heat released
m = mass of water = 100 g
c = specific heat capacity of water = 4.186 J/g.°C
T = change in temperature = 60-100 = -40
Putting values in equation , we get:
q = 100 * 4.186 * -40
q = -16744j
Ice will absorb the heat that the water releases.
So, amount of heat absorbed by ice = -q = -(-16744) J = 16744 J
We employ the following equation to determine the reaction's enthalpy change:
H = q/m
where,
q = amount of heat absorbed = 16744 J
m = mass of ice melted = ?
H = heat of fusion = 333 J/g
Putting values in equation , we get:
333J/g = 1674/ m
m = 1674 / 333 = 50.3g
Consequently, 50.3 g of ice will have melted
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How much heat, in joules, does it take to raise the temperature of 225. 0 g of water from 25. 0°c to 100. 0°c ?.
The amount of heat required to raise the temperature of 225.0 g of water from 25.0°C to 100.0°C is equal to 67,837 joules.
What is temperature?
A physical quantity known as temperature expresses the concepts of hotness as well as coldness in numerical form. With a thermometer, temperature is measured. Thermometers are calibrated using a number of temperature scales which historically defined various reference points as well as thermometric substances. The most widely used scales are the Kelvin scale (K), which is primarily used for scientific purposes, the Fahrenheit scale (°F), as well as the Celsius scale (°C), formerly known as centigrade, with the unit symbol °C. In the Worldwide System of Units, one of the eight base units is the kelvin (SI).
The amount of heat, in joules, required to raise the temperature of 225.0 g of water from 25.0°C to 100.0°C can be calculated using the equation:
Q = mcΔT
where
Q = heat in joules,
m = mass of the water in grams,
c = specific heat capacity of water,
ΔT = change in temperature (100.0°C – 25.0°C = 75.0°C).
Using these values, the equation can be rearranged to:
Q = (225.0 g) (4.184 J/g°C) (75.0°C)
Therefore, the amount of heat required to raise the temperature of 225.0 g of water from 25.0°C to 100.0°C is equal to 67,837 joules.
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What is the concentration of ppmv of carbon monoxide with a concentration of 103.
8.999×10^-2 ppmv is the concentration of ppmv of CO.
How to calculate concentration of ppmv CO?Concentration is defined as amount of solute per amount of solution or solvent.
To convert from ppm by mass to ppm by volume, divide by the density of the particles.
Calculation:The conc of CO = 103 mg/m³
=0.103 mg/m³ air
Molecular weight if CO = 28g/mol
Moles of CO = 0.103×10^-3 g/28g/mol
= 3.678×10^-6 mol
Calculate the volume of CO as follows:
V=nRT/P
=3.678×10^-6 mol × 8.314 Pa m³/mol K × 298.15 / 101325 Pa
= 8.999×10^-8 m³ CO/m³ air
Convert units of V into pmv as follows
=8.999×10^-8 m³ CO/m³ air ×10^6
=8.999×10^-2 ppmv
Or 0.08999 ppmv
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Which is a product of photosynthesis and a reactant of cellular respiration?
Multiple choice question.
carbon dioxide
water
glucose
B) Carbon Dioxide
Cellular respiration is the process by which plant and animal cells break down sugars, convert them to energy, and then use them to do work at the cellular level. The purpose of cellular respiration is simple. It provides cells with the amount of energy they need to function. It would be absolutely useless if a living being could not obtain the necessary energy from food. All living things eventually die, regardless of the quality or quantity of food.
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If you know an object ditance from the un in kilometer how can you find it ditance
As, 150,000,000 km = 1 AU. To convert km to AU, divide the distance in km by 150,000,000.
In this way, we can find the distance.
What is distance?
Distance is an object's overall motion in a directionless fashion. Regardless of an object's starting or ending point, distance can be defined as the amount of ground it has travelled.
In molecular geometry, the average distance between the nuclei of two bound atoms in a molecule is referred to as bond length or bond distance.
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the airbags that protect people in car crashes are inflated by the extremely rapid decomposition of sodium azide, which produces large volumes of nitrogen gas.
The airbags that protect people in car crashes are inflated by the extremely rapid decomposition of sodium azide, which produces large volumes of nitrogen gas.
So the balanced chemical equation is:
NaN₃(s) → Na(s) + 1.5 N₂(g)
Since, pV=nRT
The mass of sodium azide = 79.3g
What is nitrogen gas?
Nitrogen is the chemical element with the symbol N and atomic quantity 7. Nitrogen is a nonmetal and the lightest member of institution 15 of the periodic table, often called the pnictogens. it's miles a not unusual detail within the universe, estimated at 7th in general abundance inside the Milky manner and the solar gadget. At preferred temperature and stress, two atoms of the detail bond to form N2, a drab and odorless diatomic gasoline. N2 paperwork about 78% of Earth's environment, making it the most ample uncombined detail.To know more about nitrogen gas, click the link given below:
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HOMOGENEOUS VS.
HETEROGENEOUS MATTER
Classify the following substances and mixtures as either homogeneous or heterogeneous.
Place a ✔️ In the correct column.
HOMOGENEOUS
1. flat soda pop
2. cherry vanilla ice cream
3. salad dressing
4. sugar
5. soil
6. aluminum foil
Name
7. black coffee
HETEROGENEOUS
HOMOGENEOUS
✔️ 1. flat soda pop
✔️ 2. cherry vanilla ice cream
✔️ 3. salad dressing
✔️ 4. sugar
HETEROGENEOUS
5. soil
aluminum foil
black coffee
Homogeneous substances and mixtures are uniform in composition and have the same properties throughout. Heterogeneous substances and mixtures are not uniform in composition and can have different properties in different parts.
Flat soda pop is a homogeneous mixture because it is a uniform mixture of water, carbon dioxide gas, and various flavors and sweeteners.
Cherry vanilla ice cream is a homogeneous mixture because it is a uniform mixture of milk, cream, sugar, cherries, and vanilla flavor.
Salad dressing is a homogeneous mixture because it is a uniform mixture of oil, vinegar, and various flavors and seasonings.
Sugar is a homogeneous substance because it is a pure substance made up of molecules with the same chemical formula.
Soil is a heterogeneous mixture because it is made up of a combination of minerals, organic matter, water, and air, which can vary in composition and properties in different parts of the mixture.
Aluminum foil is a heterogeneous mixture because it is made up of thin sheets of aluminum metal mixed with other substances, such as coatings or additives, which can vary in composition and properties in different parts of the mixture.
Black coffee is a homogeneous mixture because it is a uniform mixture of water, coffee beans, and various flavors and aromas.
The classification of the substances and mixtures as either homogeneous or heterogeneous:
HOMOGENEOUS:
Flat soda pop: ✔️
Salad dressing: ✔️
Sugar: ✔️
Black coffee: ✔️
HETEROGENEOUS:
Cherry vanilla ice cream: ✔️
Soil: ✔️
Aluminum foil: ✔️
Any material or combination that is homogeneous throughout and difficult to discern with the eye is referred to as homogeneous matter. Due to their similar composition, flat soda pop, salad dressing, sugar, and black coffee are categorized as homogenous in this example.
Contrarily, heterogeneous matter describes substances or mixes that are visibly distinct and have an uneven or non-uniform composition. Aluminum foil, cherry vanilla ice cream, and dirt are all examples of heterogeneous materials since they all have distinct visible components or phases.
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what volume of nh3 gas, at standard temperature and pressure (stp), is required to react with 15.0 g of no?
At standard pressure and temperature (STP), the volume of nh3 gas required for the reaction to 15.0 g of NO is 7.4 L.
What's the standard temperature?The definition of a standard temperature is 0 degrees Celsius, or 32 degrees F or 273.15 degrees K. In essence, this is the temperature at which pure water will freeze at sea level in air at standard pressure.
Briefing :m(NO) = 15 g; mass of nitrogen(II) oxide.
M(NO) = 30 g/mol; molar mass of nitrogen(II) oxide.
V(NH₃) = ?
n(NO) = 15 g ÷ 30 g/mol.
n(NO) = 0.5 mol; amount of nitrogen(II) oxide.
From chemical reaction: n(NO) : n(NH₃) = 6 : 4.
0.5 mol : n(NH₃) = 6 : 4.
n(NH₃) = 0.33 mol; amount of ammonia.
Vm = 22.4 L/mol; molar volume at STP.
V(NH₃) = 0.33 mol · 22.4 L/mol..
V(NH₃) = 7.4 L
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The complete question is -
This balanced chemical equation represents a chemical reaction: 6NO + 4NH3 → 5N2 + 6H2O
What volume of NH3 gas, at Standard Temperature and Pressure (STP), is required to react with 15.0 g of NO?
(c) Explain your answers in A student mixed equal volumes of Ethanol and butanoic acid. He added a few drops of concentrated Sulphuric (VI) acid and warmed the mixture (i) Name and write the formula of the main products Name... Formula.. (ii) Which homologous series does the product named in (i) above belong? ***PLEASE HELP IT'S HOMEWORK
Answer:
Products: Ethyl butanoate + Water ||| C6H12O2 + H2O
This Compound is an Ester
Explanation:
So I assume that this question is an esterification question for a few reasons.
1. Since there is a Carboxylic acid and Alcohol reacting, it automatically means that it is esterification.
2. Sulphuric Acid is used as a catalyst so it won't affect this question in any way.
* Water is formed since you'd remove H from the Alcohol's Hydroxyl group, and when you remove an OH from the carboxyl group in the carboxylic acid.
Hopefully, this helped but since I don't have much context, I had to assume that you are doing Chemistry 30, Organic Chemistry.
What the frequency of an electromagnetic radiation with wavelength of 4.257 x 10^-9 m what type of EMR is this
Answer: The frequency is 7.047 Hz. It comes under ultraviolet radiation
Explanation:
We know that v = λ x f ................. (1)
where v ⇒ velocity of the wave
f ⇒ frequency of the wave
λ ⇒ wavelength of the wave
Since we know that the given wave is electromagnetic radiation,
v = 3 x 10⁸ m/s
λ = 4.257 x 10^-9 m (Given)
Substituting in (1), we get
f = v / λ
f = 3 x 10^8 / 4.257 x 10^-9
f = 7.047 x 10^16 Hz
Since the frequency is in the order of 16, the given radiation is ultraviolet radiation
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This element is in the noble gas family and has 5 energy levels.
The noble gas family includes the element xenon, which has five different energy levels.
What is noble gas?Any of a class of rare gases with high stability and very low reaction rates, such as helium, neon, argon, krypton, xenon, and occasionally radon. also known as inert gas. A collection of chemical elements known as the noble gases have a number of things in common. Under typical circumstances, they are all monatomic, tasteless, and colourless gases with low chemical reactivity. Helium, neon, argon, krypton, xenon, and radioactive radon are the six types of noble gases that are found in nature. Noble gases have entirely filled outer electron shells, are most frequently encountered as monatomic gases, and have no tendency to combine with other elements. As a result, they extremely infrequently form compounds with other elements. But it is conceivable to cause a noble gas to respond, just as one might force a nobleman to lose his honor.
Where is noble gas and what is noble gases used for?Due to their filled valence shells (octets), which render them incredibly nonreactive, the noble gases (Group 18), which are found at the far right of the periodic table, were formerly known as the "inert gases." Compared to other element groupings, the noble gases were characterized at a relatively late stage.
The noble gases are employed to create inert atmospheres, usually for arc welding, to shield specimens and prevent chemical reactions. The substances are utilized in lasers as well as lamps like neon and krypton headlamps.
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a hydrocarbon is combusted in an excess of air. 15.32 grams of carbon dioxide and 7.32 grams of water are produced. what is the empirical formula of the compound?
Empirical formula for your substance is C3H7. I'll demonstrate a different method for calculating the amount of carbon in moles.
What does GCSE empirical formula mean?The simplest entire number quantity of atoms from each component is the empirical formula for the compound. It is empirically determined utilizing data from experiments. For instance, while glucose has the chemical formula C 6H 12O 6, the chemical equation is CH 2O.
How does the empirical formula inform us?Molecular formulae display the quantity of each type of atom found in a molecule, while structural formulas display the simplest whole-number relationship between the atoms in a compound. Empirical formulations display the simplest whole-number relationship between the atoms in a compound.
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Recommendations suggest a way that each farm could change their farming practices to prevent pollution of the river with nitrates.
The most efficient approaches to minimize nitrate pollution of rivers are to utilize biofertilizers instead of synthetic nitrogen fertilizers or to reduce their use altogether, in farming.
What is Nitrate pollution?
Groundwater and rivers may become contaminated with nitrogen from a variety of sources. The environment naturally contains a certain amount of nitrogen, and small amounts of nitrate are essential nutrients. However, there is an issue with the high nitrate levels found in significant anthropogenic contributions such as sewage, animal waste, nitrogen-based fertilizers, agricultural runoff, and fertilizers.
What are Biofertilizers?
A biofertilizer is a substance that contains living microorganisms that, when added to soil, seeds, or plant surfaces, colonize the plant's rhizosphere and encourage growth by boosting the supply or availability of essential nutrients to the host plants.
Hence, the most efficient approaches to minimize nitrate pollution in rivers are to utilize biofertilizers.
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if your isolated product has succinimide present, what key feature should be present in the ir spectrum of your product?
If the product contain succinimide, its IR spectra should show aprominent peak at around 1700 cm-1, indicating an incomplete reaction.
What defines an element's spectrum?Because various elements have varying quantities of protons and varied numbers and configurations of electrons, they also have different spectra. The variations in spectra are a result of the energy that atoms absorb or emit as their electrons shift between different energy levels.
Is there a spectrum for every element?Every element generates an own collection of spectral lines. A line spectrum can be used to distinguish between different elements because no two produce the same spectral lines.
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Which changes of state are characterized by having atoms that gain energy? check all that apply. Meltingsublimationfreezingvaporizationcondensationdeposition.
Melting, vaporization and sublimation are changes of state that are characterized by atoms that gain energy.
What is Melting?
The physical process that causes a substance's phase to change from solid to liquid. This happens when the solid's internal energy rises, usually as a result of heat or pressure being applied, which raises the substance's temperature to the melting point.
What is vaporization?
The transformation of a substance into a gaseous (vapour) phase from its liquid or solid state. Boiling is the term for the vaporization process when conditions permit the creation of vapour bubbles within a liquid.
What is Sublimation?
The immediate transition of a material from its solid to its gas state without first going through its liquid phase is called the sublimation process.
Hence, melting, vaporization and sublimation are changes of state that are characterized by atoms that gain energy.
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11. Calculate the relative atomic mass of uranium using the percent abundances given.
238U-50%
235U-20%
234U-30%
Answer:
Relative atomic mass of uranium = (238 x 0.50) + (235 x 0.20) + (234 x 0.30) = 236.3
Identifying Parts of a Chemical Reaction
Given chemical reaction,
Glucose + Oxygen → carbon dioxide + water
Reactants : Glucose and oxygen.
Products : carbon dioxide and water.
Parts of chemical reaction:Each chemical reaction is made up of three main components: the reactants (located on the left side of the reaction equation), the products (located on the right side of the reaction equation), and the particular reaction conditions, which are listed above or below the arrows in the middle of the reaction equation.
Combustion is one of the five fundamental types of chemical reactions, along with combination, decomposition, single-replacement, and double-replacement. You can classify a reaction into one of these groups by looking at the reactants and products of the reaction in question. It is possible for some reactions to fall into more than one category.
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Mention how a halogen substituent can be replaced by a deuterium atom in the preparation of a deuterated compound
A halogen substituent can be replaced by a deuterium atom in the preparation of a deuterated compound :
CH₃CHBrCH₂CH₃ + Mg + ether ---> CH₃CHMgBrCH₂CH₃ + D₂O -->
CH₃CHDCH₂CH₃
In The reaction with the deuterium donor , the Grignard reagent converts into R- D . the grignard reagent react with proton donor to convert R - MgX to R-H. The grignard reagent the magnesium salt. the grignard reagent is an organometallic compound. the formula for the grignard reagent is RMgX.
CH₃CHBrCH₂CH₃ + Mg + ether ---> CH₃CHMgBrCH₂CH₃
CH₃CHMgBrCH₂CH₃ + D₂O --> CH₃CHDCH₂CH₃
Thus, the above reaction is the preparation of a deuterated compound.
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In a spectrophotometer, both absorbance and transmittance indicate choose. Passing through a sample. A high absorbance corresponds to a choose. Transmittance.
In a spectrophotometer, both absorbance and transmítanse indicate the amount of light passing through a sample. A high absorbance corresponds to a low transmittance.
What is absorbance?
It quantifies a substance's ability to absorb light of a certain wavelength. It is equal to the reciprocal of the transmittance logarithm. The amount of light that a solution absorbs, also known as optical density.
What is Transmittance?
It is the ratio of light energy that falls on a body to light energy that passes through it. In other words, it is the ratio of light passing through the sample to light incident on it, whereas reflectance is the ratio of light reflected to light incident.
In a spectrophotometer, both absorbance and transmittance indicate the amount of light passing through a sample. A high absorbance corresponds to a low transmittance.
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Ammonia gas has a molar mass of approximately 13 grams per mole. At 260K and 2.6 atm, a sample of ammonia has a volume of 2.5 L. In three to five sentences, explain how you can find the mass of the ammonia. Then, given R= 0.0821L⋅atm/mol⋅K, calculate the mass.
The mass of the ammonia, given that the sample of the ammonia has a volume of 2.5 L is 3.965 g
How do I determine the mass of the ammonia?First, we shall obtain the number of mole of the ammonia. Details below:
Temperature (T) = 260 KPressure (P) = 2.6 atmVolume (V) = 2.5 LGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?PV = nRT
Divide both sides by RT
n = PV / RT
n = (2.6 × 2.5) / (0.0821 × 260)
n = 0.305 mole
Now, we shall determine the mass of the ammonia. Details below:
Mole of ammonia = 0.305 moles Molar mass of ammonia = 13 g/molMass of ammonia =?Mole = mass / molar mass
Cross multiply
Mass = Mole × molar mass
Mass of ammonia = 0.305 × 13
Mass of ammonia = 3.965 g
Thus, we can conclude that the mass of the ammonia is 3.965 g
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how many lone pairs of electrons does the oxygen atom with the negative charge bear? (enter answer as a number.)
As a result, we already have one bond. We require three lone pairs of electrons for the oxygen to have a negative one formal charge.
How many lone pairs does a negatively charged oxygen have?Three unpaired electrons and one non-bonding lone pair on the oxygen can be utilized to make bonds with three hydrogen atoms.
An oxygen atom has three valence electron pairs since it has six valence shell electrons. Since oxygen creates two bonds, we know that two electrons are required to create those two bonds. There are now just two electron pairs remaining that are not involved in bonding.
There are three valence electron pairs in an oxygen since it has six valence shell electrons.
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Which of the following is true of real machines?
The statement that is correct about real machines is that work output is less then work input. So the correct option is A.
Why the statement is correct?This is correct because in a real machine the production of work will never be greater than the input it has of work, since the machines themselves will lose energy in some way during the formation of the production of work. When losing energy, then, there will be less production and material than there was at the beginning of production.
This is quite the opposite in an ideal machine, where all the work that will be put in becomes the work output. It changes because in the ideal situation it does not take into account various variables that occur in reality that can cause energy to be lost in the process.
Therefore, we can confirm that the correct option is A. work output is less then work input.
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Which of the following is true of real machines?
A. work output is less then work input
B. work output equals work input
C. work input is decreased because of friction
D. work output is greater than work input
A certain quantity of HI(g) is introduced to a 1.0 L container at a temperature in which K =6 for H2+ I2 = 2HI. when equilibrium is established, there are 1.8 mol I2 present. How many moles of HI were introduced originally?
The initial moles of the HI introduced is 6.2 moles.
What is the number of moles of HI?We know that the equilibrium constant can only be obtained from the concentration of the substance at the point of equilibrium. We would have to set up the ICE table as shown below;
2HI ⇆ [tex]H_{2}[/tex] + [tex]I_{2}[/tex]
I a 0 0
C - x + x + x
E a - x 1.8 1.8
We can see that in this case; x = 1.8 and the equilibrium constant = 1/6 = 0.17
K = [ [tex]H_{2}[/tex] ] [ [tex]I_{2}[/tex]]/[HI]^2
0.17 = (1.8)^2/ (a - 1.8)^2
0.17 = 3.24/(a - 1.8)^2
0.17a^2 - 0.61a + 0.55 = 3.24
0.17a^2 - 0.61a - 2.69 = 0
a=6.2 M
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