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- JA H;° of H2O(1) is -285.8 kJ/mol. calculate A H;° of MgO. The relevant reactions for these two heats of formation are: H2(g) + ½ O2(g) H20(1) and Mg(s) + ½ O2(g) - MgO(s) > -141.3 kj/mol a) -306.6 kj/mol b) -447.9 kj/mol c) d) -592.4 kj/mol 141.3 kj/mol f) Not even information givenThe chemical structure of ethanol (CH, CH, OH) is shown below. Highlight each atom that is in a methyl group. H H H –C -C О — Н H H :0 :4) H3C Br Br CH3 'CI + + HỈOH Н ОН Дон ОН SH КОН H2O