Michael H. answered • 06/15/21

Real Estate and HR Professional

**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**