Post-Lab 2 - markowitz(am45362 – Post-lab 2 Enthalpy –...

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Unformatted text preview: markowitz (am45362) – Post-lab 2 Enthalpy – lyon – (51900) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Consider the reaction 2 Al 2 O 3 (s) → 4 Al(s) + 3 O 2 (g) . Δ H = +3339 . 6 kJ/mol What is Δ H for the formation of one mole of Al 2 O 3 (s) from the elements? 1.- 1669.8 kJ 2.- 3339.6 kJ 3.- 6679.2 kJ 4. +1669.8 kJ 5. +3339.6 kJ 002 10.0 points What is the best definition of specific heat? 1. the boiling point of a substance 2. the quantity of heat energy that must beabsorbed to increase the temperature of one gram of a substance by one degree Celsius 3. the difference between the freezing pointand the boiling point of a substance 4. the quantity of heat energy that must beabsorbed to make one gram of a substance boil 003 10.0 points For the combustion reaction of ethylene (C 2 H 4 ) C 2 H 4 + 3 O 2 → 2 CO 2 + 2 H 2 O assume all reactants and products are gases, and calculate the Δ H rxn using the following Δ H f values (in kJ/mol): Δ H f C 2 H 4 = 52 Δ H f CO 2 =- 393 Δ H f O 2 = 0 Δ H f H 2 O =- 242 1. 1322 kJ/mol 2.- 1322 kJ/mol 3. 687 kJ/mol 4. 0 kJ/mol 5.- 687 kJ/mol 004 10.0 points Calculate the standard reaction enthalpy for the reaction. CH 4 (g) + H 2 O(g) → CO(g) + 3 H 2 (g) given 2 H 2 (g) + CO(g) → CH 3 OH( ℓ ) Δ H ◦ =- 128 . 3 kJ · mol − 1 2 CH 4 (g) + O 2 (g) → 2 CH 3 OH( ℓ ) Δ H ◦ =- 328 . 1 kJ · mol − 1 2 H 2 (g) + O 2 (g) → 2 H 2 O(g)...
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Post-Lab 2 - markowitz(am45362 – Post-lab 2 Enthalpy –...

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