Nitrogen gas can be prepared by passing gaseous ammonia over solid copper(II) oxide at high temperatures. The other products of the reaction are solid copper and water vapor. If a sample containing 18.1 g of NH3 is reacted with 90.4 g of CuO. a. Which is the limiting reactant? b. How many grams of N2 will be formed?c. If only 8.2 grams of N2 are actually formed during the experiment, what is the percent yield?