Chemistry Help.?

Question

Nitrogen dioxide gas reacts with hydrogen gas producing ammonia gas, water vapor and releases 100kJ of heat. The chemical carbon tetrachloride served as a catalyst for the reaction.

1. Write and balance chemical reaction described above using the smallest whole-numer coefficients. Be sure to include the heat and the catalyst in the balanced equation.

2. If 23.0g of Nitrogen Dioxide gas reacts with excess hydrogen gas, how many grams of water vapor are produced?

3. What does the carbon tetracloride do?



Thank you for the help

Answer 1

part 1
====

2NO2 (g) + 7H2 (g) -----> 2NH3 (g) + 4H2O (g) (delta H = -1000kJ/mol)

note: to include the catalyst, write CCl4 above the arrow in the equation.

part 2
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we'll need to determin the number of moles of NO2 used:

0.23 g NO2 x [1 mol NO2 / 46 g NO2] = 0.005 mol NO2

now use the coefficients in the balanced equation to dtermine the number of moles of water formed:

0.005 mol NO2 x [4 mol H2O / 2 mol NO2] = 0.01 mol H2O

now convert moles of water to grams;

0.01 mol H2O x [18 g H2O / 1 mol H2O] = 0.18 g H2O

part 3
====

the carbon tetrachloride is a catalyst, so it doesnt' get consumed in the reaction, it just makes the reaction proceed faster.

Answer 2

Identify the redox participants:
N+4 goes to N-3
H2(0) goes to H+1 in ammonia and water.

2 NO2 + 7 H2 -> 2 NH3 + 4H2O + heat
Unless you want to put CCl4 over the arrow, it usually is NOT included in the equation.

Divide 23 g by mol weight of NO2, call result A moles
From equation A moles will produce 2A moles of water.
Multiply 2A by mol wt of water to get answer.

CCl4 is the catalyst, although how it is a catalyst, I don't know.

Answer 3

1.)I have no idea.

2.)I have no idea.

3.)Carbon tetrachloride was widely used for decades as a cleaning fluid and solvent, including for
degreasing equipment and machinery parts at facilities such as the Hanford Site. It was also
used at the Hanford Site in the refining process during the separation of plutonium. In the past,
carbon tetrachloride was commonly used in the dry cleaning industry and in homes as a spot
remover and was also used to make refrigerator fluids and propellants for aerosol cans. It was
also used in agriculture through the mid-1980s as a fumigant to kill insects in grain. Although
carbon tetrachloride is still used in some industrial applications, its production is being phased
out in this country and in many others because of concerns about its effects on the earth’s
ozone layer.

Answer 4

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