AP QUIZZES - AP TOPIC 9 Thermochemistry SET B
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QUESTION 1. The enthalpy of combustion of methanol (CH3OH) is -711 kJmol-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 kJmol-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) If the reaction is spontaneous Delta G will be negative
(E) The reaction will instantaneously occur

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. Which of the following terms must be negative, in reactions that are spontaneous (feasible)?

(A) Delta H
(B) Delta S
(C) Delta G
(D) Temperature
(E) Activation Energy




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