REGULAR QUIZZES - REGULAR TOPIC 12 Thermochemistry SET B
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QUESTION 1. The enthalpy of combustion of methanol is -711 kJ mol-1. What mass of methanol must be completely burned in oxygen in order to produce 71.1 kJ of energy?

(A) 32g
(B) 3.2g
(C) 71.5g
(D) 715g
(E) None of the above

QUESTION 2. Given that the Delta H for the reaction below is = +X kJ mol-1, what is the Average Bond Dissociation enthalpy for C-H?

CH4(g) ==> C(g) + 4H(g)


(A) +X
(B) -X
(C) +X/4
(D) -X/4
(E) +4X

QUESTION 3. Which one of the following statements is FALSE when referring to an EXOTHERMIC reaction?

(A) The Delta H value will be negative and the products have a lower enthalpy than the reactants
(B) The products are energetically more stable than the reactants
(C) Energy is released to the surroundings
(D) Combustion reactions are Exothermic
(E) Delta H is negative AND energy is taken in

QUESTION 4. The standard enthalpy of combustion of Hydrogen gas requires how many moles of Oxygen gas?

(A) 0
(B) 1
(C) 2
(D) 0.5
(E) 1.5

QUESTION 5. What are the products of complete combustion of 1 mole of propane (C3H8)?

(A) 3 moles of carbon dioxide and 2 moles of water
(B) 3 moles of carbon dioxide and 4 moles of water
(C) 3 moles of carbon monoxide and 4 moles of water
(D) 4 moles of carbon dioxide and 4 moles of water
(E) None of the Above




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