CHEMISTRY HIGH SCHOOL

How much heat is released by the combustion of 2 mol of methane?
Use mc019-5.jpg.

Answers

Answer 1
Answer: From literature, the heat of combustion of methane is 55.5 MJ/kg methane. to account for the 2 mol of methane given we convert 2 mol to kg which is determined by multiplying 2 mol by molec.weight (16g/mol) divided by 1000 to convert to kg. This is equal to 0.032 kg methane. We multiply this to 55.5 MJ/kg.The total heat released is 1.776 MJ.

Related Questions

Which is a compound?a. iodine.b. water.c. calcium.d. air.
When aqueous solutions of HCl and NaOH are mixed together in a calorimeter, the temperature of the solution increases. The reaction isendothermic, causing an increase in the kinetic energy of the solute particles. endothermic, causing an increase in the kinetic energy of the water molecules. (exothermic, causing an increase in the kinetic energy of the water molecules.) exothermic, causing an increase in the kinetic energy of the solute particles.
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Classify wine and beef stew as homogeneous or heterogeneous.

Answers

Wine is a homogenous mixture while beef stew is a heterogeneous mixture as it has components which are clearly visible.

What are  the heterogeneous mixtures?

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

Learn more about heterogeneous mixtures,here:

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Wine is a homogeneous mixture. Homogeneous means same throughout. Most things with water are homogeneous. You only see the wine in this mixture.
Beef Stew is heterogeneous mixture. You can see the beef AND stew, it is different throughout. Not the same. Most heterogeneous mixtures are chunky or lumpy.

When magnesium is added to hydrochloric acid, a gas is formed. Explain what happens in the reaction, how the gas is collected and how it could be tested to prove what it is.

Answers

Answer:

Explained below.

Explanation:

Formula when magnesium reacts with hydrochloric acid is given by;

Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(g)

So, from the equation, we can see that the gas formed is hydrogen.

This hydrogen gas is collected by a method known as water displacement.

This gas can be tested for by holding a burning splint near to the top of the test container. The resulting effect should be a high pitched pop sound because the hydrogen gas will react with the oxygen gas in the air to result in a small explosion.

Third time im asking... really need help..Assuming all of the atoms attached to the central atom were identical, which of the following geometries would produce a nonpolar molecule? (Only 3 choices are correct.)

-linear
-trigonal planar
-tetrahedral
-trigonal bipyramidal
-octahedral
-bent (angular)

Answers

I'm not an expert on this, but I have done some work. Non-symmetrical shapes are polar, so octahedral, tetrahedral and linear are non-polar since they are symmetrical

In the pie chart below, which of the following represents the amount of Earth's water located in the oceans?A pie chart with part A representing 2%, part B representing .8%, part C representing .2% and part D representing 97%.


A only
A and B
C only
D only

Answers

D Only . 97% is ocean

Answer:

D Only . 97% is ocean

Explanation:

What type of acid is sulfuric acid?a- Monoprotic
b- Diprotic
c- Triprotic
d- None of the above

Answers

The answer is Diprotic!

Select all that apply. Which statements correspond to cellular respiration? O 2 is pumped in and forces CO 2 out. CO 2 diffuses passively out of the cell. CO 2 must be pumped out of the cell. CO 2 diffuses passively into the cell. O 2 diffuses passively when converted to CO 2. O 2 diffuses passively when produced inside the cell.

Answers

Answer:

The correct answer is CO2 diffuses passively out of the cell.

Explanation:

Carbon dioxide  is one of the end product of cellular metabolism.CO2 is produced as waste material inside the body after cellular respiration.

      Carbon dioxide is transported out from the body by passive diffusion process which helps the CO2 gas to move along the concentration gradient from high concentration region(body) to the low concentration region(atmosphere).

    Thus CO2 ia being eliminated from our body.
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Can someone pls help indicate the number of significant figures with these numbers: 34g, 564 l, 19.3 mm, 23.45 mg, 101 km, and 3400 g
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An atom of chlorine has several valence electrons in itsa. second shell. b. first shell. End of exam c. third shell. d. nucleus.