REGULAR QUIZZES - REGULAR TOPIC 12 Thermochemistry SET E
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QUESTION 1. Hydrogen molecules have a bond enthalpy of 436 kJ per mole. What is the enthalpy change when 2 moles of hydrogen atoms are produced from a hydrogen molecule?

(A) +436 kJ
(B) -436 kJ
(C) +873 kJ
(D) -872 kJ
(E) None of the Above

QUESTION 2. The equation that represents the standard enthalpy of combustion of propane (C3H8) produces how many moles of products?

(A) 1
(B) 3
(C) 5
(D) 7
(E) 8

QUESTION 3. Which of the following equations represents BOTH the standard enthalpy of formation of zinc oxide, AND the standard enthalpy of combustion of zinc?

(A) Zn(s) + 0.5 O2(g) ==> ZnO(s)
(B) Zn(g) + 0.5 O2(g) ==> ZnO(s)
(C) Zn(s) + O(g) ==> ZnO(s)
(D) Zn(g) + O(g) ==> ZnO(s)
(E) None of the above

QUESTION 4. The standard enthalpies of combustion of methylbenzene (C7H8), Carbon and Hydrogen are -3910, -394 and -286 kJmol-1 respectively. Calculate the standard enthalpy of formation of methylbenzene in kJmol-1.

(A) +3230
(B) +8
(C) -8
(D) -1136
(E) -4590

QUESTION 5. A metal has a specific heat capacity of .899 Jg-1K-1 How much energy is required to raise the temperature of 2.00 kg of the metal by 80 K?

(A) 80 kJ
(B) 35.96 kJ
(C) 179800 kJ
(D) 143.84 J
(E) 143.84 kJ




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