are these the same questions CH 12 TestMultiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question.____1.The calculation of quantities in chemical equations is called ____.a.stoichiometryc.percent compositionb.dimensional analysisd.percent yield____2.What is conserved in the reaction shown below? H(g) + Cl(g) 2HCl(g)a.mass onlyc.mass, moles, and molecules onlyb.mass and moles onlyd.mass, moles, molecules, and volume____3.What is conserved in the reaction shown below? N(g) + 3F(g) 2NF(g)a.atoms onlyc.mass and atoms onlyb.mass onlyd.moles only____4.In a chemical reaction, the mass of the products ____.a.is less than the mass of the reactantsb.is greater than the mass of the reactantsc.is equal to the mass of the reactantsd.has no relationship to the mass of the reactants____5.In the reaction 2CO(g) + O(g) 2CO(g), what is the ratio of moles of oxygen used to moles of COproduced?a.1:1c.1:2b.2:1d.2:2____6.Which of the following is true about the total number of reactants and the total number of products in the reaction shown below?CH(l) + 8O(g) 5CO(g) + 6HO(g)a.9 moles of reactants chemically change into 11 moles of product.b.9 grams of reactants chemically change into 11 grams of product.c.9 liters of reactants chemically change into 11 liters of product.d.9 atoms of reactants chemically change into 11 atoms of product.____7.How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) 3Fe(s) +