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Midterm1FormAspring2011With solutions

Midterm1FormAspring2011With solutions - Chem 1B Midterm...

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Chem. 1B Midterm Exam 1 Spring 2011, April 22, 2011 FORM A There are a total of 14 questions of equal value on the exam. You will keep the exam so you can check your answers. The answers to the exam will be posted on our course web page. Carefully check all your answers on your Scantron form. SCANTRON FORM: Completely fill bubbles Completely fill answers (1) Write your name (2) Bubble in FORM A (3) Bubble in your PERM number (7 digits only, no extra numbers) INFORMATION PAGE: Only aid allowed is the information page. No other notes or books are allowed. INSTRUCTIONS: Cell Phones, iPods, headsets, and any other electronic devices must be turned off and put away. Please remain seated until 12:50PM 1. The heat of combustion of propane, C 3 H 8 (g), at 25 o C, is -2220 kJ/mol. That is, 𝐶 3 𝐻 8 ( 𝑔 ) + 5 𝑂 2 ( 𝑔 ) 3 𝐶𝑂 2 ( 𝑔 ) + 4 𝐻 2 𝑂 ( 𝑙 ) ∆𝐻 𝑜 = 2,220 𝑘𝐽 Calculate the standard enthalpy of formation, ∆𝐻 𝑓 𝑜 , of propane at 25 o C, using the values of the enthlapies of formation of CO 2 and H 2 O given on the data/formula sheet. (A) 52 kJ/mol (B) -104.5 kJ/mol (C) 71.5 kJ/mol (D) -84.7 kJ/mol (E) 112 kJ/mol (2,3,4) A system consisting of an ideal monatomic gas initially at 100 o C and occupying a volume of 5 L is heated at a constant pressure of 1 atm until it expands to 12L.
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