Which of the following statements is TRUE? Select one: A;Ho for C(diamond) is zero. O If a system involves contraction of a gas, the system does work on the surroundings. Endothermic reactions make the surroundings warm up. Condensation is an example of an exothermic process. O 2Na(g) + Cl2(g) 2NaCl(s) is a correct formation reaction for sodium chloride.

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