1 you have probably heard the two sayings nothing lasts, Ask an Expert

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1. You have probably heard the two sayings, "Nothing lasts forever" and "Diamonds are forever". They can't both be right, which one is correct?! Calculate the standard free energy change at 298K for the conversion of diamonds to graphite and determine whether or not the reaction is spontaneous under standard conditions:

C(diamond) --> C(graphite);

?Hf°(diamond) = 1.895 kJ/mol; S°(diamond) = 2.337 J mol- 1K-1; S°(graphite) = 5.740 J mol-1K-1.
A. 2.19 kJ; not spontaneous
B. -1.90 kJ; spontaneous
C. -2.90 kJ; spontaneous
D. 1.90 kJ; not spontaneous
E. 4.04 kJ; not spontaneous

2. Even if a processs is "spontaneous", what other information is needed to tell if the reaction will actually proceed?

A. Equilibrium constant.
B. Rate of reaction.
C. Reactant pressures
D. Reactant and product pressures
E. Temperature.

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Category:- Chemistry
Reference No.:- M91038864

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