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Chem 2 FINAL F07 KEY

Chem 2 FINAL F07 KEY - Final Exam CHEM 002 Fall 2007 Name...

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Final Exam, CHEM 002 Fall, 2007. Name: _________________________ Date: ____________ Before answering any question(s) involving a chemical equation, please ensure the chemical equation is balanced. 1) Which of the solutions below will have the highest electrical conductivity? a) 0.050 M Ca(OH) 2 b) 0.050 M AgCl c) 0.050 M Na 3 PO 4 2) An unknown acid contains only hydrogen, nitrogen and oxygen; the acid was analyzed and found to contain 0.81% hydrogen and 22.41 % nitrogen. Assuming the unknown acid is monoprotic, what is its’ molecular formula if 20.00 g of NaOH were required to completely neutralize 125.03 g of the acid? a) HNO 3 b) H 2 N 4 O 12 c) HNO 4 d) H 4 N 8 O 24 e) HN 2 O 6 3) How many mL of 0.150 M NaOH are required to completely react with 15.0 mL of 0.300 M H 3 PO 4 ? NaOH (aq) + H 3 PO 4 (aq) Na 3 PO 4 (aq) + H 2 O (l) 4) How many grams of CO 2 will be produced if 1.00 g of C 2 H 5 OH is combusted in the presence of 2.50 g of O 2 ; the reaction yield is 80.0%? C 2 H 5 OH + O 2 CO 2 + H 2 O
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