Question

Stoichiometry 1. 2Na + 2H20 → 2NaOH + H2 a). How many moles of sodium are required to produce 5.0 moles of NaOH, sodium hydroxide? b) How many moles of H2 are produced in the reaction with 5.0 grams of water? 2. Sn + 2HF → SnF2 +H; a). How many grams of SnF2 are produced from the reaction of 30.0 g of HF? b) How many moles of HF will be needed to react with 10 moles of Sn?

Answer 1

1. a) 2 : 5 2 Na + 2 H₂O 2 NaOH + H₂ moles of NaOH produced froom 2 moles of Na moles of NaOH will be produced from 2x5 = 5 moles of Na H2 5 moles of sodium are required. b 5g of H₂O = 5 mol = 0.27 mol of H₂O Molano mass of H₂O = 18 g/mol 2 mol of H₂O produces I mol of H₂ 0.27 mol of H₂O produces 0.27 mol = 0.13 mol of 10.13 mol of He are produced 2. a In + 2HF Sn F₂ + H₂ Molaro mass of HE = 20.006 g/mol Molan mass of Sn F₂ = 156.69 g/mol 2 mol of HF produce I mod of sn F2 (2x 20.006) g = 40.012 g of HF produce 156.69 g of SnFz 30 g of HF produce 40.012 g SnFa (117.48 g of Sufa are produced. o mol of sn neacts with 2 mol of HF 10 mol of In reacts with (2x 10) mol = 20 mod off HE (20 moles of HF will be needed. 156.69x30 g = 117.48 g of