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(FATEC) Considere as afirmações a seguir, segundo a Lei de Hess.I - O calor de reação (ΔH) depende apenas dos estados inicial e final do processo.II - As equações termoquímicas podem ser somadas como se fossem equações matemáticas.III - Podemos inverter uma equação termoquímica desde que se inverta o sinal de ΔH.IV - Se o estado final do processo for alcançado por vários caminhos, o valor de ΔH dependerá dos estados intermediários através dos quais o sistema pode passar.Conclui-se que:a) as afirmações I e II são verdadeiras.b) as afirmações II e III são verdadeiras.c) as afirmações I, II e III são verdadeiras.d) todas são verdadeiras.e) todas são falsas.

"As borboletas brancas, azuis, amarelas e pretas na luz as belas borboletas. Borboletas brancas são alegres e francas. Borboletas azuis gostam de muita luz. As amarelinhas são tão bonitinhas! E as pretas então... Oh, que escuridão!"

Observe a equação termoquímica a seguir e marque a alternativa correta.CH com 4 subscrito espaço mais espaço 2 reto O com 2 subscrito espaço seta para a direita espaço CO com 2 subscrito espaço mais espaço 2 reto H com 2 subscrito reto O espaço incremento reto H espaço igual a espaço menos 802 espaço kJa) A equação representa uma reação de combustão incompleta.b) A equação indica que a reação quando ocorre absorve calor.c) O oxigênio é o combustível dessa reação endotérmica.d) A equação indica que 1 mol de CH4 ao reagir libera 889,5 kJ.

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