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(Enem/2014) A escolha de uma determinada substância para ser utilizada como combustível passa pela análise da poluição que ela causa ao ambiente e pela quantidade de energia liberada em sua combustão completa. O quadro apresenta a entalpia de combustão de algumas substâncias. As massas molares dos elementos H, C e O são, respectivamente, iguais a 1 g/mol, 12 g/mol e 16 g/mol.Substância Fórmula Entalpia de combustão (KJ/mol)Acetileno C2H2 - 1298Etano C2H6 - 1558Etanol C2H5OH - 1366Hidrogênio H2 - 242Metanol CH3OH - 558Levando-se em conta somente o aspecto energético, a substância mais eficiente para a obtenção de energia, na combustão de 1 kg de combustível, é oa) Etano.b) Etanol.c) Metanol.d) Acetileno.e) Hidrogênio.

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