Answer:
0.1765 Kg / m3
Explanation:
Mass of cholesterol = 39mg
Volume = 221mL
The concentration is given as; Mass/ Volume
Concentration = 39 / 221 = 0.1765 mg /mL
The relationship between mg / mL and Kg / m3 is;
1 mg / mL = 1 Kg / m3
This means that;
0.1765 mg /mL = 0.1765 Kg / m3
What are the starting substances (molecules) in a chemical equation called?
Answer:
A chemical reaction is the process in which atoms present in the starting substances rearrange to give new chemical combinations present in the substances formed by the reaction. These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.
empirical formula for
Ca 40.078 22.3%
As 74.9216 41.6%
O 15.9994 35.6%
H 1.00794 0.560%
The empirical formula : CaAsO₄H
Further explanationThe empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
Determine the mass ratio of the constituent elements of the compound. Determine the mole ratio by by dividing the percentage by the atomic mass Ca[tex]\tt \dfrac{22.3}{40.078}=0.556[/tex]
As[tex]\tt \dfrac{41.6}{74.9246}=0.555[/tex]
O[tex]\tt \dfrac{35.6}{15.9994}=2.225[/tex]
H[tex]\tt \dfrac{0.56}{1.00794}=0.556[/tex]
Divide by the smallest ratio(0.555) :
Ca : As : O : H ⇒
[tex]\tt \dfrac{0.556}{0.555}\div \dfrac{0.555}{0.555}\div \dfrac{2.225}{0.555}\div \dfrac{0.556}{0.555}=1\div 1\div 4\div 1[/tex]
A student must prepare 7.00 L of 0.100 M Na2CO3 (106 g/mol). Which is the best procedure for preparing this solution
Answer:
Measure 74.2 g Na2CO3 and add H20 until the final homogeneous solution has a volume of 7.00 L
Explanation:
The best procedure is
Mole of
[tex]Na_2CO_3 = Volume \times molarity\\\\= 7.00 L \times 0.100 mol\\\\[/tex]
= 0.700 mol
The mass of
[tex]Na_2Co_3 = Moles \times molar\ mass \\\\= 0.700 mol \times 106 g/mol[/tex]
= 74.2 g
So as per the above calculation, the option 3 is correct as the solution volume is 7.00 L so the same is to be considered
hence, all other options are wrong
defferent between crysttiline solid and amerphus solid
Answer:
Crystalline solids have well-defined edges and faces, diffract x-rays, and tend to have sharp melting points. In contrast, amorphous solids have irregular or curved surfaces, do not give well-resolved x-ray diffraction patterns, and melt over a wide range of temperatures.
Explanation:
Hope this helped!
1. A baseball pitcher won 75% of the games he pitched. If he pitched 43 ballgames, how many games
did he win?
Answer:
He won 32 games.
Explanation:
Another way of expressing 75% is 75/100.
To calculate how many games the baseball pitcher won, we multiply the total of games played (43, in this case) by the percent won:
43 * 75/100 = 32.25 ≅ 32
So the baseball pitcher won 32 games.
if there is no mass # and n # how do you find the mass # and n #
HELP
1. A student determines that the number of grams in a sample of Al2O3 is 18.3 grams. How many moles are in the sample?
2. A chemist needs 35 grams of CaO for a chemical reaction. How many moles of CaO are needed for the chemical reaction?
3. For an acid-base titration, 126 grams of H2SO4 were needed. How many moles of H2SO4 were needed for the Laboratory Activity?
4. A student needs 100 g of vinegar (CH3COOH) for a lab activity. How many moles does the student need?
Answer:
Explanation:
1)
Given data:
Mass of Al₂O₃ = 18.3 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 18.3 g/ 101.96 g/mol
Number of moles =0.18 mol
2)
Given data:
Mass of CaO needed = 35 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 35 g/ 56 g/mol
Number of moles =0.625 mol
3)
Given data:
Mass of H₂SO₄ needed = 126 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 126 g/ 98.1 g/mol
Number of moles = 1.28 mol
4)
Given data:
Mass of vinegar = 100 g
Number of moles = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 100 g/ 60.1 g/mol
Number of moles = 1.66 mol
Identify the place which has the highest boiling point of water. Identify the place which has the highest boiling point of water. Denver, Colorado, 5280 feet Death Valley, 282 feet below sea level New Orleans, sea level Mt. Everest, 29035 feet A pressurized passenger jet, 35,000 feet
Answer:
B. because if it was to change so would the amount of wieght that gravity puts on us.
Explanation:
A. might seem right but it's not 35,000 under seal level is the OPPOSITE of 35,000 above sea level.
C. water pressure can change where you are at because of the speed or the type of body of water.
D. it does not make any sense.
hope this helps!!!
Adipic acid, C6H10O4, is a raw material for the making of nylon and it can be prepared in the laboratory by the following reaction between cyclohexene, C6H10, and sodium dichromate, Na2Cr2O7 in sulphuric acid.
3 C6H10 + 4 Na2Cr2O7 + 16 H2SO4 >
3 C6H10O4 + 4 Cr2(SO4)3 + 4Na2SO4 + 16 H2O
To prepare 12.5 grams of adipic acid in 68.6% yield requires how many grams of cyclohexen
Mass of Cyclohexen : 10.2 g
Further explanationReaction
3 C6H10 + 4 Na2Cr2O7 + 16 H2SO4 >
3 C6H10O4 + 4 Cr2(SO4)3 + 4Na2SO4 + 16 H2O
mol C6H10 : mol C6H10O4 = 3 : 3 = 1 : 1
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\68.6\%=\dfrac{12.5}{theoretical}\times 100\%\\\\theoretical=18.22~g[/tex]
12.5 grams of C6H10O4 , mol C6H10O4 (MW 146.14 g/mol):
[tex]\tt \dfrac{18.22}{148}=0.123[/tex]
mol C6H10 = mol C6H10O4 = 0.124
mass C6H10 :
[tex]\tt 0.124\times 82.16=10.2~g[/tex]
what is the mass of 16.6 x 10^23 molecules of barium nitrate
The mass of 16.6 × 10²³ molecules of barium nitrate is 718.7g
The number of moles of a substance can be calculated by dividing the mass by its molar mass. That is;no. of moles = mass(g) ÷ molar mass (g/mol)no. of moles of Ba(NO3)2 = 16.6 × 10²³ ÷ 6.02 × 10²³no. of moles = 2.75 × 10⁰no. of moles = 2.75moles. Molar mass of Ba(NO3)2 = 261.34g/molmass of Ba(NO3)2 = 261.34 × 2.75Mass of Ba(NO3)2 = 718.7gTherefore, the mass of 16.6 × 10²³ molecules of barium nitrate is 718.7g.Learn more at: https://brainly.com/question/15743584?referrer=searchResults
In order to make 159 ml of a 0.135 M benzoic acid solution, what mass of benzoic acid (C7H6O2) is required?
Answer:
Explanation:
159 mL of .135 M benzoic acid will contain
.159 x .135 = .021465 moles of benzoic acid.
Molecular weight of benzoic acid = 122 gm
grams of .021465 moles = 122 x .021465 = 2.6 grams .
So 2.6 grams of benzoic acid will be required .
At 25 ∘C only 0.0180 mol of the generic salt AB is soluble (at equilibrium) in 1.00 L of water.What is the value for Ksp for this salt at 25 ∘C?
Answer:
Ksp = 3.24 x 10⁻⁴
Explanation:
The dissociation equilibrium for a generic salt AB is:
AB(s) ⇄ A⁺(aq) + B⁻(aq)
s s
For instance, the expression for the Ksp constant is:
Ksp = [A⁺] [B⁻] = s x s = s²
According to the problem, 0.0180 mol of the salt is soluble in 1.00 L os water. That means that the solubility of the salt (s) is equal to 0.0180 mol per liter.
s = moles of solute/L of solution = 0.0180 mol/L
Thus, we calculate Ksp from the s value as follows:
Ksp = s² = (0.0180)² = 3.24 x 10⁻⁴
2.If a liquid has a volume of 5800 mL and you need the volume in Liters, will the number appear to
become smaller or larger?
Answer:
The number becomes smaller
Explanation:
Volume = 5800mL
To be converted to L
The relationship between mL and Liters is given as;
1 L = 1000 mL
This means that;
1 L = 1000 mL
x L = 5800 mL
x = 5800 / 1000 = 5.8 L
Comparing 5.8 with 5800, the number becomes smaller.
How does the density and distribution of your “stars” change as the balloon expands?
Answer:
The Universe is constantly expanding and as it expands the stars and objects in space move farther apart, just like the points on the balloon when air is blown into it. Density and distribution of "stars" as the balloon expands because when volume increases the density will increase.
Hope this Helps
2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)a. Determine the volume (mL) of 15.0 M sulfuric acid needed to react with 45.0 g of aluminum to produce aluminum sulfate.b. Determine the % yield if 112 g of aluminum sulfate is produced under the above conditions.
Answer:
a. 167 mL.
b. 39.3 %.
Explanation:
Hello!
In this case, for the undergoing chemical reaction, since 45.0 g of aluminum react, based on the 2:3 mole ratio with sulfuric acid, we can compute the required moles as shown below:
[tex]n_{H_2SO_4}=45.0gAl*\frac{1molAl}{27.0gAl} *\frac{3molH_2SO_4}{2molAl} =2.50molH_2SO_4[/tex]
Next, since the molarity of a solution is computed based on the moles and volume (M=n/V), we can compute the required volume of sulfuric acid as shown below:
[tex]V=\frac{n}{M}=\frac{2.50mol}{15.0mol/L}=0.167L[/tex]
That in mL is 167 mL.
Moreover, for the percent yield, we compute the grams of aluminum sulfate that are produced based on the required 2.50 moles of sulfuric acid:
[tex]m_{Al_2(SO_4)_3}=2.50molH_2SO_4*\frac{1molAl_2(SO_4)_3}{3molH_2SO_4}*\frac{342.15gAl_2(SO_4)_3}{1molAl_2(SO_4)_3} \\\\m_{Al_2(SO_4)_3}=285.13gAl_2(SO_4)_3[/tex]
Therefore the percent yield is:
[tex]Y=\frac{112g}{285.13g}*100\%\\\\Y=39.3\%[/tex]
Best regards!
write a short paragraph about your daily activities nowadays
Ones day my include eating, resting, exercising. Unfortunately mine included not eating, not sleeping, and not exercising. I lay wife awake on my bed wishing for deaths door to find me sooner than later. I do my chores because if I don’t then my parents may take away the few things I love most. In conclusion, my daily activities include thoughts of “ why am I still alive” and actions of crying, punching ext.
Phases of matter
Soild
*
*
*
Liquid
*
*
*
Gas
*
*
Every element in group one has ______________ electron in its outer shell. Every element in group two has _______________ electrons in its outer shell.
need help
Match each word with the correct definition. 1. to have an effect on someone or something technology 2. practical application of knowledge, tools and crafts heretic 3. a usual behavior, attitude or quality 4. an attitude of doubt or a belief that knowledge is not certain influence 5. a person who disagrees with an accepted belief skepticism
A definition is an explanation of a word or a term for clarity.
What is a definition?The term definition has to do with the correct explanation of a term or word.
The following are the appropriate definitions of the words;
heretic - a person who disagrees with an accepted belief skepticismtechnology - practical application of knowledge, tools and craftsinfluence - to have an effect on someone or somethingLearn more about definition:https://brainly.com/question/14217480?
#SPJ1
1. Heretic: A heretic is a person who disagrees with an accepted belief. For example, during the Middle Ages, individuals who questioned or challenged the teachings of the Catholic Church were often labeled as heretics.
2. Influence: Influence refers to the ability to have an effect on someone or something. It can be the power to shape someone's opinions, decisions, or behavior. For instance, parents, teachers, and friends can have a significant influence on a person's choices and actions.
3. Technology: Technology refers to the practical application of knowledge, tools, and crafts. It involves using scientific and engineering principles to create new devices, processes, or systems that enhance human life. Examples of technology include smartphones, computers, and medical equipment.
4. Skepticism: Skepticism is an attitude of doubt or a belief that knowledge is not certain. Skeptics question claims, ideas, or beliefs and seek evidence or logical reasoning to support them. For instance, a person who is skeptical of conspiracy theories would ask for concrete evidence before accepting such claims as true.
5. Habit: A habit is a usual behavior, attitude, or quality that is acquired through repetition and becomes automatic. It is often formed by consistently performing a specific action. For example, brushing teeth before bed can become a habit through repetition and eventually be done without conscious thought.
Sorry that was a lot to read (lol)
Why does determining volume work only for a regular shaped object
Answer:
Because only regular-shaped objects have a consistent length, width, height, and shape.
Explanation:
Because only regular-shaped objects have a consistent length, width, height, and shape. When dealing with an object composed of differing shapes, your must calculate each portion separately and then add them.
A 13.8 g of zinc is heated to 98.8 c in boiling water and then dropped onto a beaker containing 45.0 g of water at 25.o °C .when the water and metal come to thermal equilibrium the temperature is 27.1°C .what is the specific heat capacity
Answer:
[tex]C_{zinc}=0.400\frac{J}{g\°C}[/tex]
Explanation:
Hello!
In this case, by considering thermodynamics and the temperature of zinc, we can infer it is hot while water is cold, it means that the heat lost by the zinc is gained by the water and we can write:
[tex]Q_{Zn}=-Q_{water}[/tex]
In terms of mass, specific heat and temperatures we can write:
[tex]m_{Zn}C_{Zn}(T_{eq}-T_{Zn})=-m_{water}C_{water}(T_{eq}-T_{water})[/tex]
In such a way, by solving for the specific heat capacity of the zinc we write:
[tex]C_{zinc}=\frac{-m_{water}C_{water}(T_{eq}-T_{water})}{m_{Zn}(T_{eq}-T_{Zn})}[/tex]
Thus, by plugging in the given values we obtain:
[tex]C_{zinc}=\frac{-45.0g*4.184\frac{J}{g\°C}* (27.1\°C-98.8\°C)}{13.8g*(27.1\°C-98.8\°C)}\\\\C_{zinc}=0.400\frac{J}{g\°C}[/tex]
Best regards!
Which statement describes how phase changes can be diagrammed as a substance is heated?
The phase is on the y-axis and the temperature is on the x-axis.
The temperature is on the y-axis and the phase is on the x-axis.
The time is on the y-axis and the temperature is on the x-axis.
The temperature is on the y-axis and the time is on the x-axis.
Answer:
The temperature is on the y-axis and the time is on the x-axis.
Explanation:
Which statement describes how phase changes can be diagrammed as a substance is heated? (D is the answer)
The phase is on the y-axis and the temperature is on the x-axis.
The temperature is on the y-axis and the phase is on the x-axis.
The time is on the y-axis and the temperature is on the x-axis.
The temperature is on the y-axis and the time is on the x-axis.
Which statement describes the appearance of a temperature-vs.-time graph? (C is the answer)
A horizontal line shows that the temperature increases at a constant rate over time.
A vertical line shows that the temperature decreases at a constant rate over time.
Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases.
Horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.
Which chemical equation is balanced? OCH4 + O2 + H2O + CO2 OCH4 + O2 + 2H2O + CO2 O 6 CH4 + O2 + 2H2O + 2 CO2 OCH4 + 202 + 2H2O + CO2
Answer:
CH₄ + 2O₂ → 2H₂O + CO₂
Explanation:
Chemical equation:
CH₄ + O₂ → H₂O + CO₂
Balanced chemical equation:
CH₄ + 2O₂ → 2H₂O + CO₂
Option d is correct option.
1st step:
CH₄ + O₂ → H₂O + CO₂
Left hand side Right hand side
C = 1 C = 1
H = 4 H = 2
O = 2 O = 3
Step 2:
CH₄ + O₂ → 2H₂O + CO₂
Left hand side Right hand side
C = 1 C = 1
H = 4 H = 4
O = 2 O = 4
Step 3:
CH₄ + 2O₂ → 2H₂O + CO₂
Left hand side Right hand side
C = 1 C = 1
H = 4 H = 4
O = 4 O = 4
Gallium is produced by the electrolysis of a solution made by dissolving gallium oxide in concentrated NaOH(aq). Calculate the amount of Ga(s) that can be deposited from a Ga(III) solution using a current of 0.710 A that flows for 60.0 min.
Answer:
0.00883 mol
Explanation:
Let's consider the reduction reaction of gallium.
Ga³⁺(aq) + 3 e⁻ ⇒ Ga(s)
We can establish the following relationships:
1 min = 60 s1 A = 1 C/s1 mole of electrons have a charge of 96486 C (Faraday's constant)When 3 moles of electrons circulate, 1 mole of Ga is depositedThe amount of Ga deposited using a current of 0.710 A that flows for 60.0 min is:
[tex]60.0min \times \frac{60s}{1min} \times \frac{0.710C}{s} \times \frac{1mole^{-} }{96486C} \times \frac{1molGa}{3mole^{-}} = 0.00883 molGa[/tex]
Now consider a sample of the gas at 33 deg C, 744 mm Hg, and 450 mL. If the pressure is decreased to 725 mm Hg and the temperature raised to 66C. What is the new volume of the gas? New volume =
Answer:
V₂ = 511.59mL
Explanation:
Given data:
Initial volume = 450 mL
Initial pressure = 744 mmHg
Initial temperature = 33°C (33 +273 = 306 K)
Final temperature = 66°C (66+273 = 339 K)
Final pressure = 725 mmHg
Final volume =?
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 744 mmHg × 450 mL × 339 K / 306 K ×725 mmHg
V₂ = 113497200 mmHg .mL. K / 221850 K.mmHg
V₂ = 511.59mL
9. What type of bond is pictured in the image below?
Alt
Alt
Alt
--
AI+
Alt
Alt
Alth
AN
1
a. covalent bond
b. ionic bond
c. metallic bond
d. electron bond
Answer:
metallic bond
because this diagram is electron gas theory which shows metallic bond
Ammonia's unusually high melting point is the result of:__________
a. dipole-dipole forces.
b. London dispersion forces.
c. hydrogen bonding.
d. covalent bonding.
e. ionic bonding.
Answer:
c. hydrogen bonding.
Explanation:
Hydrogen bonding occurs when hydrogen is covalently bonded to a highly electronegative atom such as oxygen, flourine, nitrogen etc.
Hydrogen bonds are quite strong and are known to lead to elevated boiling points. As a result of hydrogen bonding, ammonia is known to have a high melting and boiling point compared to its relative molecular mass.
which have
different numbers of electrons?
Answer:
These are called isotopes. They have the same number of protons (and electrons), but different numbers of neutrons. Different isotopes of the same element have different masses. Mass is the word for how much substance (or matter) something has.
How do you know your cell's are working
How many atoms do the elements of sodium hypochlorite have?
Answer:
The chemical formula is NaClO and consists of one atom of sodium (Na), one atom of chlorine (Cl) and one atom of oxygen (O).
Molecular Weight/ Molar Mass: 74.44 g/mol
Density: 1.11 g/cm³
Explanation: