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66Stoich

# 66Stoich - STOICHIOMETRY GCHEM I LAB CONCEPT PROBLEMS In...

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STOICHIOMETRY GCHEM I LAB “CONCEPT PROBLEMS” In chemical reaction (2 H 2 + 1 O 2 2 H 2 0) the stoichiometric coefficients (2 and 1) represent the moles of H 2 & O 2 that will react to produce ( 2 ) moles of H 2 O. 2 moles of H 2 will react with exactly 1 moles of O 2 2 moles H 2 1 moles O 2 2 moles of H 2 will react to yield exactly 2 moles of H 2 O 2 moles H 2 2 moles H 2 O 0.17 grams H 2 react with excess O 2 to produce how many grams of H 2 O ? 0.17 grams H 2 1 moles H 2 2 moles H 2 O 18.02 grams H 2 O = 1.5 grams H 2 O 2.016 grams H 2 2 moles H 2 1 moles H 2 O MOLES TO MOLES : 2Al(s) + 6HCl(aq) 2AlCl 3 (aq) + 3H 2 (g) (ans: 7.8 moles H 2 ) 1) How many moles of H 2 gas will be produced when 5.2 moles of Al completely reacts with HCl ? 2) How many moles of AlCl 3 will be needed to completely consume 10.0 milli-moles of Al ? (1.0*10 –2 ) MOLES TO GRAMS : Balance equation ___Zn (s) + ___AgNO 3(aq) ___Ag (s) + ___Zn(NO 3 ) 2(aq) 3) How many grams of Ag will be produced when 10.5 moles of Zn completely reacts ?

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66Stoich - STOICHIOMETRY GCHEM I LAB CONCEPT PROBLEMS In...

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