please answer each of the following with work!

Reaction Stoichiometry Problems Perform the required calculations. Show all of your work and include units with your final answer. 15) If 35.0 moles of hydrogen gas react with excess oxygen gas, how many moles of water are formed? O2+2H22H2O 16) If 320. grams of lead (II) nitrate react with excess potassium chloride, what mass of lead (II) chloride is produced? Pb(NO3)2+2KCl2KNO3+PbCl2 17) If 36.0 grams of calcium react with 85.0 grams of copper (iI) nitrate, what mass of calcium nitrate is produced? Ca+Cu(NO3)2Cu+Ca(NO3)2 18) If 46.0 grams of fluorine react with 70.0grams of sodium chloride, what mass of chlorine gas will be formed? F2+2NaClCl2+2NaF 19) If 20.0 moles of hydrochloric acid react with excess sodium hydroxide to produce an actual yield of 50.0 grams of water, what is the percent yield for the reaction? HCl+NaOHH2O+NaCl 20) If 36.0 grams of oxygen gas react with excess magnesium metal, what mass of magnesium oxide is produced? 2Mg+O22MgO