Answer:
1.2 moles
Explanation:
this is the balanced equation for the reaction of oxygen (O2) and hydrogen (H2), usually we don't write the 1 in front of O2
2H₂ + 10₂ → 2H₂O
the molar ratio of hydrogen to oxygen is 2 : 1
we are trying to react with 2.4 mol of H2 so the moles of O2 is half the number of moles of H2 = 2.4 ÷ 2 = 1.2 mol
another way to think of it:
2H₂ + 10₂
2 : 1
2.4 mol : x mol
to get from 2 to 2.4 multiply by 1.2, so do the same to the other side
1 × 1.2 = 1.2 mol
How many calories are required to raise 50 g of water 100 degrees celsius?
Pls Help!!!!!
Answer:
energy known as the latent heat of vaporization is required to break the hydrogen bonds. At 100 °C, 540 calories per gram of water are needed to convert one gram of liquid water to one gram of water vapour under normal pressure.
Explanation:
it was easy
I need help. A chemist wants to dilute 100.0 ml of 2.50 M Sulfuric acid to 0.50 M Sulfuric acid. To what volume must it be diluted?
Taking into account the definition of dilution, to a volume of 500 mL, a solution of 100.0 mL of 2.50 M Sulfuric acid must be diluted to 0.50 M Sulfuric acid.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 2.50 MVi= 100 mLCf= 0.50 MVf= ?Replacing in the definition of dilution:
2.50 M× 100 mL= 0.50 M× Vf
Solving:
(2.50 M× 100 mL)÷ 0.50 M= Vf
500 mL= Vf
In summary, to a volume of 500 mL, a solution of 100.0 mL of 2.50 M Sulfuric acid must be diluted to 0.50 M Sulfuric acid.
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Select all the correct answers. Which sentences describe an advantage of using a hydrogen fuel cell instead of burning fossil fuels?
Advantages:-
Fossil fuels like methane(Natural gas) on combustion releases carbon dioxide which is a major air pollutant.On the other hand hydrogen fuels don't do pollution much or in negligible amount.So hydrogen fuels are better
Answer:
The reaction of hydrogen and oxygen conveniently takes place inside a fuel cell.
Someday, it may be possible to produce hydrogen fuel using sunlight and water.
The reaction of hydrogen and oxygen doesn’t create products that negatively affect the environment.
Explanation:
PLATO
At maximum, an f-subshell can hold __________ electrons, a d-subshell can hold __________ electrons, and a p-subshell can hold __________ electrons.
Explanation:
Different subshells hold a different maximum number of electrons. Any s subshell can hold up to 2 electrons; p supshell up to 6 electrons; d subshell up to 10; and f subshell up to 14.
Hi! I’m so confused… what is the spin quantum number?? :0
Answer:
5 on k-12 that's the answer
Explanation:
Explanation:
nah so easy
it's a direction of electron spinning in the shell
+½ means electron spinning in clockwise direction
-½ means electron spinning in anticlockwise direction
Sodium bicarbonate (baking soda), NaHCO,, can be purified by dissolving it in
hot water (60 °C), filtering to remove insoluble impurities, cooling to 0 °C to
precipitate solid Nalco, and then filtering to remove the solid, leaving
soluble impurities in solution. Any Nauco, that remains in solution is not?
recovered. The solubility of Nauco, in hot water of 60 °C is 164 g/L. Its
solubility in cold water of 0°C is 69 g/1. What is the percent yield of NaHCO,
when it is purified by this method?
Answer:
the other person is right
Explanation:
they're also wrong
Answer:
58% or 55.34%
Explanati
Hurry please!!!
Why is the production of genetically modified crops considered controversial?
AD
Genetically modified crops may have the same appearance as normal crops.
(В)
Genetically modified crops are less expensive to grow than normal crops.
©
Genetically modified crops may cause unforeseen health consequences.
D
Genetically modified crops can only be grown in warm climates.
Identify features that are present in eukaryotic cells but not in prokaryotic cells.
Answer:
Eukaryotic cells have membrane bound organelles including:
- Nucleus
- Mitochondria
- Golgi apparatus
- Vacuoles
- Endoplasmic reticulum
- Chloroplasts
Prokaryotic cells do not have these organelles.
Many forensic scientists remain working in a lab while evidence is collected by police officers.
A.
True
B.
False
Answer:
True
Explanation:
Document and photograph the evidence. Properly secure the evidence by placing it in a paper bag or envelope. Close, seal, or tape the paper bag or envelope. The examiner must initial, date, and time across the sealed area. Label the bag or envelope with the patient's identifying information.
Also, I took the quiz :)
Based on the information shown, which of the following explains why the pressure in tank X is greater than that in tank Y ?
Tank X tank y
Ar(g) N2(g)
p=150atm p=130atm
v=70L v=70L
T=21 c T=21c
The pressure in tank X is greater than that in tank Y because the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
What is the pressure of a gas?The pressure of a gas is the force that molecules of the gas exert per unit area of the walls of their container due the collisions of the gas molecules with themselves and with the walls of their contain.
The pressure of a gas is related to the volume (V), temperature (T) and number of moles (n) of the gas by the formula:
P = nRT/Vwhere;
R is molar gas constantn = mass/Molar mass.Since volume, temperature and R is constant for the two gases, the pressure difference will be determined by the number of moles of each gas.
Number of moles of a gas is proportional to the mass of the gas present.
Therefore, the best explanation as to why the pressure in tank X is greater than that in tank Y is that the number of moles or mass of argon gas in Tank X is greater than the number of moles or mass of nitrogen gas in Tank Y.
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A cheese puff contains 15 g of carbohydrate. If carbohydrates have a caloric value of 4 kcal/g, how many kcal are obtained from the carbohydrate in the cheese puff?
Will Mark Brainliest
Help Plss!!
hope it helps
cheese puff contains 15 g of carbohydrates
caloric value of carbohydrates=4kcal/g
1kcal=1000cal
4kcal/g= 4000cal/15g
ans. 266.6
kcal= 0.267 kcal.
what is the ionic equation for potassium fluoride and ammonium nitrate
Answer:
kf+Nh4 no3 --> kno3+nh4f
2. Sodium Bicarbonate decomposes when heated to form sodium carbonate, water, and
carbon dioxide gas. If 1.8 moles of carbon dioxide are produced, how many moles of
sodium bicarbonate were decomposed?
Answer:
3.6 moles of sodium bicarbonate were decomposed.
Explanation:
The decomposition of sodium bicarbonate (NaHCO₃) to form sodium carbonate (Na₂CO₃), water, and carbon dioxide gas can be represented by the following balanced chemical equation:
[tex]\displaystyle 2\text{NaHCO$_3$}_\text{(s)} \longrightarrow \text{Na$_2$CO$_3$} + \text{H$_2$O}_\text{($\ell$)} + \text{CO$_2$}_{\text{(g)}}[/tex]
We want to determine the amount of sodium bicarbonate decomposed when 1.8 moles of carbon dioxde is produced.
From the equation, we can see that the mole ratio between carbon dioxide and sodium bicarbonate is 1:2. That is, there is one mole of carbon dioxide produced for every two moles of sodium bicarbonate.
Therefore:
[tex]\displaystyle 1.8\text{ mol CO$_2$} \cdot \frac{2\text{ mol NaHCO$_3$}}{1\text{ mol CO$_2$}} = 3.6\text{ NaHCO$_3$}[/tex]
In conclusion, 3.6 moles of sodium bicarbonate were decomposed.
Heat transfer is due to molecules colliding with neighboring molecules during _____, while heat transfer is due to molecules actually moving to another location during
Heat transfer which occurs when molecules collide with neighboring molecules is Conduction while heat transfer which is due to molecules actually moving to another location is Convection.
What is Heat transfer?This is the process in which thermal(heat) energy is moved from a hot region to a cold one.
There are three main types of heat transfer which are:
ConductionConvectionRadiationThe first two types is explained above and is the most appropriate choice.
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We can measure the rate of reaction by:
-
-
Learning Task 2 Tract the location of Tropical Storm Sendong and plot each latitude and longitude pair on the map with the PAR below.
Philippine Map and its Vicinity
B. The highly toxic gas phosgene is produced by the reaction CO(g) + Cl2(g) COCl2(g), ΔH = –108 kJ/mol. Use this reaction to answer the following questions.
i. How would increasing the pressure of the system affect the reaction yield? Explain your answer. (2 points)
ii. How would increasing the pressure of the system affect the reaction rate? Explain your answer. (2 points)
iii. How would increasing the temperature of the system affect the reaction yield? Explain your answer. (2 points)
iv. How would increasing the temperature of the system affect the reaction rate? Explain your answer. (2 points)
Answer:
I. Increasing pressure will allow more frequent successful collision between particles due to the particles being closer together.
II. Rate of reaction increases due to more products being made; as increased pressure favours the exothermic side of the equilibrium.
III. Increasing temperature provides particles lots of (Kinetic) energy, for more frequent successful collision due to the particles moving at a faster rate than before. However, favouring the endothermic side of the equilibrium due to lots of energy required to break and form new bonds.
IV. Rate of reaction increases due to increase temperature favouring both directions of the equilibrium - causing products to form faster.
Hope this helps!
I. Increasing pressure will allow more frequent successful collision between particles due to the particles being closer together.
II. Rate of reaction increases due to more products being made; as increased pressure favours the exothermic side of the equilibrium.
III. Increasing temperature provides particles lots of (Kinetic) energy, for more frequent successful collision.
IV. Rate of reaction increases due to increased temperature favouring both directions of the equilibrium - causing products to form faster.
What is toxic gas phosgene?Phosgene is extremely toxic by acute (short-term) inhalation exposure. Severe respiratory effects, including pulmonary edema, pulmonary emphysema, and death have been reported in humans.
I. If the pressure of gaseous reactants is increased, there are more reactant particles for a given volume. There will be more collisions and so the reaction rate is increased. The higher the pressure of reactants, the faster the rate of a reaction will be.
II. Increasing the pressure on a gas reaction shifts the position of equilibrium towards the side with fewer moles of gas molecules.
III. Increasing temperature provides particles lots of (Kinetic) energy, for more frequent successful collision due to the particles moving at a faster rate than before. However, favouring the endothermic side of the equilibrium due to lots of energy required to break and form new bonds.
IV. If the temperature is increased, the position of equilibrium moves in the direction of the endothermic reaction. if the temperature is reduced, the position of equilibrium moves in the direction of the exothermic reaction.
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Consider a mixture of oil and water. What terms would you use to describe this mixture? Check all that apply. Heterogeneous homogeneous immiscible miscible.
Answer:
Its A and C
Explanation:
A mixture of oil and water is:
Heterogeneous
immiscible
What type of mixture of oil and water is?The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water. The mixture can be called as Emulsion. It is an immiscible liquid and the mixture is heterogeneous as oil floats on top of water surface but do not mix with it.
Thus, correct options are Heterogeneous and immiscible.
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Use bond enthalpy values to calculate the enthalpy change for the following reaction. Then, label if the reaction is endothermic or exothermic. 1) CH4 (g) + Br2 (g) --> CH3Br (g) + HBr (g)
Based on the bond energies given, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.
What is the change in bond energy of a reaction?The change in bond energy of a reaction is calculated using the formula below:
change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed
A reaction is exothermic if the change in bond energy is negative.
A reaction is endothermic if the change in bond energy is positive.
Given the bond enery values above:
sum of energies of bonds broken = 4 × C-H + Br-Br
sum of energies of bonds broken = 4 × 413 + 193 = 1845 kJ
sum of energies of bonds formed = 3 × C-H + C-Br + H-Br
sum of energies of bonds formed = 3 × 413 + 276 + 363 = 1878 kJ
Thus;
change in bond energy = 1845 - 1878 = -33 kJ
The reaction is exothermic because the change in bond energy is negative.Therefore, the enthalpy change for the reaction of is -33 kJ and the reaction is exothermic.
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Based on this information, do you think that the mole should be considered a base unit in the Sl system? Explain why or why not.
Answer:
I jus had this but i forgot srry!
Explanation:
Explain how can we apply the phase changes in our life?
Answer:
Examples of Phase Changes
For example, you have probably witnessed freezing, melting, and vaporization just by making ice, melting ice, and boiling water.
Explanation:
hope it will help you have a great day bye and Mark brainlist if the answer is correct
[tex]kai6417 \: [/tex]
#carry on learning
Explanation:
freezing occurs when are liquid changes to a solid.
melting occurs when a solid changes directly to a liquid
Explain the importance of organisms that convert nitrogen from its diatomic form into other compounds?
Explanation:
Bacteria play a key role in the nitrogen cycle.
Nitrogen-fixing microorganisms capture atmospheric nitrogen by converting it to ammonia— NH3start text, N, H, end text, start subscript, 3, end subscript—which can be taken up by plants and used to make organic molecules.
What is the ratio between the substances in the balanced chemical equation? Start from the left and move to the right (start with the first reactant, end with the last product).
2NH3 + H2SO4 → (NH4)2SO4
40 POINTS!!!! PLEASE HELP
Answer:
after solving this you can get 40 points.
Which organism would have the most variation in the DNA of its offspring
Answer:
The organism that would have the most variation in the DNA of its offspring is the CAT (i would know). Hope this helped you!
system of equations You and your friend are making 30 liters of sodium water. You have liters of 10% sodium and your friend has liters of 22% sodium. How many of your liters and how many of your friend's liters should you mix to make 30 liters of 15% sodium
Answer:
X liters of 10% + (30 - x) liters of 22% = 30...
When carbohydrates
are
digested by the body, what molecule do they become?
Answer:
Glucose
Explanation:
Both simple and complex carbohydrates break down into glucose (aka blood sugar). A simple carb is one that's comprised of one or two sugar molecules, while a complex carb contains three or more sugar molecules.
HOPE IT HELPS! BE SAFE :)
Answer:
Glucose
Explanation:
Both simple and complex carbohydrates break down into glucose.
Tetrachloroethene, C2Cl4 is a solvent used in many dry cleaning processes. Write the empirical formula for tetrachloroethene.
Answer:
CCl2 is the empirical formula. (the lowest whole-number ratio of the elements)
Explanation:
Select the correct answer from each drop-down menu. Hydrogen can be created by [ Select ] water. If the activation energy is reduced, hydrogen can be produced with a renewable energy source. This renewable energy source is [ Select ] energy.
Answer 1) Decomposing Explanation : Hydrogen can be created by decomposing water. Electrolysis which is a method of passing electricity from the water and obtaining the products as hydrogen and oxygen is done by decomposition of water. The water molecule is broken down into its constituents.
Answer 2) Solar energyExplanation :If the activation energy is reduced, hydrogen can be produced with a renewable energy source. This renewable energy source is Solar energy.Solar energy from the sun can be used to lower the energy of activation during the decomposition of water. Solar energy is a renewable energy source as it comes from the sun and is replenish-able unlike fuels which cannot be replenished. The solar energy can be collected and utilized for production of hydrogen.
Consider the reaction below. HClO3 NH3 Right arrow. NH4 ClO3– Which is a base-conjugate acid pair? NH3 and ClO3– NH3 and NH4 HClO3 and NH3 HClO3 and NH4.
Bronsted-Lowry acid-base theory states about the donation or the acceptance of the protons by the chemical species. [tex]\rm NH_{3}[/tex] and [tex]\rm NH_{4}^{+}[/tex] are the base/conjugate acid pair.
What are the acid and base pairs of the lowry theory?According to this theory, the bases are the proton [tex](\rm H^{+})[/tex] acceptors and acids are proton contributors, the reaction between the species of the acids and bases results in the proton transfer.
An acid that donates or loses the proton to form an ion or molecule forms a conjugate base while the base that accepts proton are called conjugate acids. It can be shown as,
[tex]\rm acid + base \rightleftarrows conjugate\; base + conjugate \;acid[/tex]
In the reaction of [tex]\rm HClO_{3}[/tex] and [tex]\rm NH_{3}[/tex] the chloric acid acts like acid and donates proton while ammonia acts as a base because it accepts the proton.
Therefore, option B. [tex]\rm NH_{4}^{+}[/tex] is the conjugate acid of the ammonia and[tex]\rm ClO_{3}^{-}[/tex] is the conjugate base of chloric acid.
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Answer:
B.) NH3 and NH4+
Explanation:
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