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Unformatted text preview: CHEM 2045C: Take-home quiz 7 NAME ___________KEY_________ N #_____________ Show your work for full credit Eng Q8059x07b You are allowed to use books/notes/etc, but Due by the START of Monday’s (10/29/07) lecture. you are NOT allowed to receive help from others. Late quizzes will NOT be graded. As always, show your work, follow significant figure rules and box your answers for full credit. 1. (½ pt) What is Δ H f ° for solid gold? kJ/mol The enthalpy of formation for an element in its natural state is defined as zero at standard temperature and pressure 2. (½ pt) Is ammonia more or less stable than N 2 and H 2 gas? MORE STABLE N 2 (g) + 3 H 2 (g) → 2 NH 3 (g) Δ H 1 ° = -91.8 kJ 3. (3 pts) Liquid hydrogen peroxide (H 2 O 2 ) exothermically decomposes to (liquid) water and oxygen gas. Determine the amount of energy (in kJ) released during the decomposition of 3.79 mL of hydrogen peroxide. The density of hydrogen peroxide is 1.40 g/mL. Hint: see problem 5.37....
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- Fall '10