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127e1reviewsolns-1

# 127e1reviewsolns-1 - Chem 127 Review(Wikholm A 1 Calculate...

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Chem 127 Review (Wikholm) 2008 A. 1) Calculate the average mass of a zinc atom in grams. 22 23 g 65.39g Zn 1mol Zn =1 Zn atom 1.086 10 g atom 1mol Zn 6.022x10 atoms × × = × 2) Glucose has the formula, C 6 H 12 O 6 . How many carbon atoms are there in 5.0 g of glucose? 23 23 1mol glu 6.022x10 molecules 6 C atoms 5.0g glu 1.0 10 C atoms 180.g glu 1mol glu 1 molecule × × × = × 3) What is the mass percent of C in a compound with a formula (C 5 H 5 ) 2 Fe? g C 120.1 g C % = x100%= 64.57% g cmpd 186.0 g cmpd C = B. Ammonia can be prepared from the reaction of hydrogen and nitrogen according to the following equation: N 2 (g) + 3H 2 (g) 2NH 3 (g) 1. If 50.0 grams of N 2 reacts with an excess of hydrogen, how many moles of ammonia can be produced? 3 2 2 3 2 2 2 mol NH 1mol N 50.0 g N x x 3.57 mol NH 28.0 g N 1 mol N = 2. If 20.0 grams of H 2 reacts with an excess of nitrogen, how many moles of
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