1) 1. What is the molar mass of Sodium? a) 22.99 g Na b) 12.01 g Na c) 16.0 g Na d) 39.1 g Na 2) 2. What is the molar mass of CaCl2? a) 75.53 g CaCl2 b) 40.07 g CaCl2 c) 110.98 g CaCl2 d) 115.61 g CaCl2 3) 3. If you have 16.8 g of LiF how many moles of LiF do you have? a) .20 mol LiF b) .65 mol LiF c) .88 mol LiF d) 1.0 mol LiF 4) 4. If you have 1.806 x 10²⁴ molecules of CO2 how many moles of CO2 do you have? a) 0.5 mol CO2 b) 1.0 mol CO2 c) 2.0 mol CO2  d) 3.0 mol CO2 5) What is the purpose of stoichiometry? a) To determine the coefficients needed for each substance in a chemical reaction b) To determine the charge of each ion in a compound c) To predict amounts of products when you know amounts of reactants d) To balance equations using the reactants and products 6) Mg + 2HCl -> MgCl2 + H2 If you have 2 moles of Mg, how many moles of MgCl2 are formed? a) 0.5 mol MgCl2 b) 1.0 mol MgCl2 c) 1.5 mol MgCl2 d) 2.0 mol MgCl2 7) Mg + 2HCl  MgCl2 + H₂  If you have 10.5 moles of HCl how many moles of MgCl₂ are formed? a) 1.0 mol MgCl2 b) 5.25 mol MgCl2 c) 10.5 mol MgCl2 d) 21.0 mol MgCl2 8) Mg + 2HCl  MgCl₂ + H₂ If you have 12.38 g of HCl how many grams of H₂ can be formed? a) .34 g H2 b) 1.37 g H2 c) 12.38 g H2 d) 455.89 g H2

Stoichiometry

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