3. Hydrogen gas can be produced through the following reaction. Mg(s) + 2HCI(aq) MgCl2(aq) + H2(g) a. How many grams of HCI are consumed by the reaction of 2.50 moles of magnesium? b. What is the mass in grams of H2 gas when 4.0 moles of HCI is added to the reaction? 4. Acetylene gas (C2H2) is produced as a result of the following reaction. CaC2(s) + 2H2O(I) C2H2(g) + Ca(OH)2(aq) a. If 3.20 moles of CaC2 are consumed in this reaction, how many grams of H2O are needed? b. How many grams of Ca(OH)2 would be formed with 3.20 moles of CaC2? 5. Laughing gas (nitrous oxide, N2O) is sometimes used as an anesthetic in dentistry. It is produced when ammonium nitrate is decomposed according to the following reaction. NH&NO3(s) N20(g) + 2H2O(1) a. How many moles of NH4NO3 are required to produce 33.0g of N20? b. How many moles of water are produced with 45.0g of N20?