Hello I am new to wyzant and I have desperately needed help with my chemistry homework. Please help me very quickly please

Question

1.) 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O

In the above equation, how many grams of N2 can be made when 11.8 moles of CuO are consumed?

Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0

Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:

Element	Molar Mass
Hydrogen	1
Nitrogen	14
Copper	63.5
Oxygen	16

2.) For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 14.9 moles of methane, CH4 ?

Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0

Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:

Element	Molar Mass
Hydrogen	1
Carbon	12

please please help explain and solve

Answer 1

Hello Ben,

Your questions are both a matter of simple stoichiometry.

1. 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O

In the above equation, how many grams of N2 can be made when 11.8 moles of CuO are consumed?

We begin with 11.8 mol of CuO. We know that 3 mol of CuO is equal to 1 mol of N2. We will thus divide our initial moles by this conversion factor. We now have our number of moles of N2. We simply multiply this by molar mass to get our answer! This is demonstrated in a stoichiometry table below.

11.8 mol CuO | 1 mol N2 | 28 g N2 = 110.1 g

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| 3 mol CuO | 1 mol N2

This would require 110.1 grams of N2.

2.) For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 14.9 moles of methane, CH4 ?

14.9 mol CH4 | 2 mol H2 | 2 g H2 = 59.6 g

_________________________________________

| 1 mol CH4 | 1 mol H2

This would require 59.6 g of H2.