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For each of the following processes, indicate whether the signs of S and H are expected to be positive, negative, or about zero.

(a) An explosive is detonated in a sealed container and the container becomes hot.

(b) Some nitrogen gas and some oxygen gas held in separate containers are allowed to mix.

(c) 1 mol CH4(g) and 2 mol O2(g) is formed from 1 mol CO2(g) and 2 mol H2O(l).

(d) An unstable liquid decomposes generating a gas and liberating heat.

(e) Liquid is formed by compressing a refrigeration gas.

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