How many liters of O2 needed to react with excess C to produce 85 liters of CO? 2C+O2 --> 2CO and also What volume of of ammonia at STP will be produced when 6 g of Magnesium nitride reacts with excess of water. Mg2N2 + 6H20 ---> 3Mg(OH)2 + 2NJ3 THANK YOU so much, please help me, I have been stressing over how to learn this for a week now and I could really use your help. thanks!