(1) Calculate (a) q when a system does 54 J of work and its energy decreases by 72 J. (b) DE for a gas that releases 38 J of heat and has 102 J of work done on it. (2) Consider the combustion of one mole of methyl alcohol, CH3OH(l), which yields carbon dioxide gas and steam. (a) Write a thermochemical equation for the reaction. (Use Table 8.2.) (b) Calculate DE at 258C.

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