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Question

2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2O

In the above equation how many grams of N2 can be made when 170 grams 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

Answer 1

2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2O

Begin by calculating the weight of 170g CuO into g/mol aka molar mass.

To do this add 63.5 g/mol for Cu and 16 g/mol for O. Adding these equals a molar mass for CuO of 79.5 g/mol.

Next we need to calculate how many moles 170g of CuO is. This is done by dividing 170g by the molar mass of CuO, which we just calculated was 79.5 g/mol. Dividing 170g by 79.5 g/mol gives us 2.14 mol of CuO. Check the units and note that grams are canceled out when doing this division.

With 2.14mol of CuO we need to note the ratio of moles of CuO to N2 produced in the already balanced equation. The ratio is 3 CuO to 1 N2.

The last step is to set up a ratio and solve for the moles of N2.

3CuO = 2.14 mol CuO

1N2 Xmol N2

cross multiplying gives us: 3x = 2.14; solving for x gives us our answer of 0.71 mol of N2