If you mix 40.0 grams of Cu with 50.0ml of 1.20 M HNO3 solution, how many grams of NO gas can be made?
The reaction is
3 Cu + 8 HNO3 �¨ 3 Cu2+ + 2 NO + 4 H2O + 6 NO3-
First you need to determine the limiting reactant, Cu or HNO3. It looks like it is HNO3. There is only 0.06 moles of it.