exam2chem30a

exam2chem30a - Chem 30A, Spring 2000 EXAM #2 Name_ Dr....

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Chem 30A, Spring 2000 EXAM #2 Name______________________ Dr. Harrison Avagadro's number = 6.02 x 10 23 1. (15 pts) Calculate the following based on the compound (NH 4 ) 2 HPO 4 : (write in the correct units) a) Molar mass = 132.0 g/mole b) How many moles are in 42.7g ? 0.323 mole c) How many grams are in 3.00 moles? 396 g d) How many hydrogen atoms are in 111.3 g? 4.568 x 10 24 hydrogen atoms e) How many grams does 1 molecule weigh? 2.19 x 10-22 g/molecule 2. (8 pts) Classify the following as an oxidation, reduction, or combustion reaction. (place an O for oxidation, a R for reduction, and a C for combustion.) a. NAD + + H 2 NADH + H + ____ R __ c. 2Mg + O 2 2MgO O or C _ b. C 2 H 6 O + 3O 2 2CO 2 + 3H 2 O ___ C _ d. Cl 2 2Cl - ____ R _____
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3. (12 pts) Balance the following reactions: a) ____ C 3 H 8 + __ 5 _ O 2 __ 3 _ CO 2 + __ 4 __ H 2 O b) __ 3 _ NiCl 2 + __ 2 _ Na 3 PO 4 ____ Ni 3 (PO 4 ) 2 + _ 6 _NaCl c) ____ UO 2 + __ 4 _ HF ____ UF 4 + __ 2 _ H 2 O d) __ 2 _ N 2 H
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exam2chem30a - Chem 30A, Spring 2000 EXAM #2 Name_ Dr....

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