Answer to Question #293787 in Physical Chemistry for Roman

Question

2 NH₃  +  3 CuO → 3 Cu  +  N₂  +   3 H₂O

In the above equation, how many grams of N₂ can be made when 4.4 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.:

Answer 1

The molar mass of CuO is 63.5 + 16 = 79.5

The molar mass of N2 is 2×14 = 28

According to the equation, for every 3 molecules of CuO, one molecule of N2 is made.

Therefore 3×79.5 g of CuO make 28 grams of N2.

Therefore 195 g of CuO make 28×(195/3×79.5) = 22.9 g of N2.