5) P4 (s) + 10 Cl2(g) 4 PCl5 (s)H = - 435.2kcal Based on the reaction shown, whi

Question

5) P4 (s) + 10 Cl2(g) 4 PCl5 (s)H = -435.2kcal

Based on the reaction shown, which statement is true?

A) When 30.97 g P4 (s) react, 435.2 kcal are released.

B) When 1 mol P4 (s) reacts, 435.2 kcal are released.

C) When 123.88 g P4 (s) react, 435.2 kcal are consumed.

D) When 208.22 g PCl5 (s) are produced, 435.2 kcal areconsumed.

E) When 1 mol PCl5 (s) is produced, 435.2 kcal are released.

6) Entropy can be defined as

A) the amount of disorder in a system.

B) the state of equilibrium in a system.

C) the amount of energy required to initiate a reaction.

D) the number of chemical bonds which are changed during areaction.

E) the amount of energy required to rearrange chemicalbonds.

7) In the process of dissolving sugar in water, theentropy increases. This means that the sign of S is

________, and that the randomness of the system ________.

A) negative; decreases

B) undetermined; increases

C) positive; decreases

D) positive; increases

E) negative; increases

8) The concept of free energy allows prediction of spontaneityof a process by considering the

changes in ________ and ________ during the process.

A) entropy; temperature

B) enthalpy; mass

C) enthalpy; entropy

D) enthalpy; temperature

E) entropy; mass

9) A process which is unfavorable with respect to enthalpy, butfavorable with respect to entropy

A) could occur at high temperatures, but not at lowertemperatures.

B) could not occur regardless of temperature.

C) could occur at any temperature.

D) could occur at low temperatures, but not at highertemperatures.

E) none of the above

10) For the reaction given below, what quantity of heat will beproduced if 90.0 g of C3H8 are

consumed in the reaction?

C3H8 + 5 O2 3 CO2 +4 H2O + 488kcal

A) 996kcal           B)488 kcal          C) 976kcal           D)332 kcal          E)239 kcal

Explanation / Answer

5 C 6 A 7 D 8 C 9 A 10 C

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