mid2_w04 - Please use the following constants and...

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Please use the following constants and conversions in the problems below as needed h = 6.626 × 10 -34 J-s R H = 1.097 × 10 7 m -1 c = 3.00 × 10 8 m/s Avogadro&s Number = 6.022 × 10 23 Energy level of an electron in a hydrogen atom: E n = (-2.18 × 10 -18 J)( 1/n 2 ) 1. [7 points] Which of the following equations represents the standard enthalpy of formation of calcium sulfite? (a) Ca 2+ (aq) + SO 3 2- (aq) CaSO 3 (s) (b) 2Ca(s) + 2S(s) + 3O 2 (g) 2CaSO 3 (s) (c) Ca(s) + S(s) + 3 / 2 O 2 (g) CaSO 3 (s) (d) Ca(s) + S(s) + 3 O (g) CaSO 3 (s) (e) Ca(s) + S(s) CaS(s) 2. [7 points] If 55.2 g of sodium chlorite is reacted with 12.1 g of glucose (C 6 H 12 O 6 ) according to the following thermochemical equation: 6NaClO 2 (s) + C 6 H 12 O 6 (s) 6NaCl(s) + 6CO 2 (g) + 6H 2 O(l) H = -4835 kJ What quantity of heat is released (assuming the pressure is held constant)? (a) 2.95 × 10 3 kJ (b) 492 kJ (c) 325 kJ (d) 4.84 × 10 3 kJ (e) 651 kJ 3. [7 points] 1.00 kg samples of iron (C s = 0.45 J/g-K) and water (C s = 4.18 J/g-K) are initially both at a temperature of 30 ° C. If 50.0 kJ of heat is added to both samples what is the difference in the final temperature of the water and the iron? Assume no heat is lost to the surroundings. (a) The temperature of the iron is 99 ° C hotter than the water (b) The temperature of iron is 37 ° C hotter than the water (c) The iron and water are at the same temperature (d) The temperature of the water is 37 ° C hotter than the iron (e) None of the above
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4. [7 points] Given the following thermochemical equations: H 2 (g) + N 2 (g) + 3O 2 (g) 2HNO 3 (aq) H = &414 kJ N 2 O 5 (s) + H 2 O(l) 2HNO 3 (aq) H = &86 kJ O 2 (g) + 2H 2 (g) 2H 2 O (l) H = &572 kJ Use Hess± law to calculate the enthalpy of the following reaction: 2N 2 (g) + 5O 2 (g) 2N 2 O 5 (s) (a) &157 kJ (b) -1572 kJ (c) +72 kJ (d) &1072 kJ (e) &84 kJ 5. [7 points] Given the following standard enthalpies of formation: H f ° Fe 2 O 3 (s) = -826 kJ/mol H
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This note was uploaded on 07/17/2008 for the course CHEM 121 taught by Professor Wyzlouzil during the Fall '07 term at Ohio State.

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mid2_w04 - Please use the following constants and...

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