key3(2) - CHEM 1211K Test III MULTIPLE CHOICE (3 points...

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CHEM 1211K Test III MULTIPLE CHOICE (3 points each) 1) H for the reaction IF 5 (g) + Æ IF 3 (g) + F 2 (g) is ________ kJ, give the data below. IF(g) + F 2 (g) Æ IF 3 (g) H = -390 kJ IF(g) + 2 F 2 (g) Æ IF 5 (g) H = -745 kJ A) +355 B) -1135 C) +1135 D) +35 2) A sample of aluminum metal absorbs 9.86 J of heat, upon which the temperature of the sample increases from 23.2 o C to 30.5 o C. Since the specific heat capacity of aluminum is 0.90 J/g-K, the mass of the sample is ______ g. A) 72 B) 1.5 C) 65 D) 8.1 3) Which of the following is a statement of Hess's law? A) If a reaction is carried out in a series of steps, the H for the reaction will equal the sum of the enthalpy changes for the individual steps. B) If a reaction is carried out in a series of steps, the H for the reaction will equal the product of the enthalpy changes for the individual steps. C) The H for a process in the forward direction is equal in magnitude and opposite in sign to the H for the process in the reverse direction. D) The H for a process in the forward direction is equal to the H for the process in the reverse direction. 4) Given the data in the table below, H rxn for the reaction Ca(OH) 2 + 2 H 3 AsO 4 Æ Ca(H 2 AsO 4 ) 2 + 2 H 2 O is ________ kJ. Substance H f o Ca(OH) 2 -986.6 H 3 AsO 4 -900.4 Ca(H 2 AsO 4 ) 2 -2346.0 H 2 O -285.9 A) -744.9 B) -4519 C) -4219 D) -130.4 5) The combustion of titanium with oxygen produces titanium dioxide: Ti(s) + O 2 (g) Æ TiO 2 (s) When 0.721 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00
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key3(2) - CHEM 1211K Test III MULTIPLE CHOICE (3 points...

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