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Exercício de VARIAÇÃO DE ENTALPIA
Exercício:
1-(UEL) A combustão completa do etino (mais conhecido
como acetileno) é representada na equação a seguir.
C2H2(g) + 2,5O2(g) → 2CO2(g) + H2O(g) ΔH0 = -1255 kJ
Assinale a alternativa que indica a quantidade de
energia, na forma de calor, que é liberada na combustão
de 130 g de acetileno, considerando o rendimento dessa
reação igual a 80 %.
a) -12.550 kJ
b) – 6.275 kJ
c) – 5.020 kJ
d) – 2.410 kJ
e) – 255 kJ
b
na combustao completa ele libera 1255 kj com um mol de C2H2.
usando 180g de C2H2( fazendo a converçao de gramas pra mol) ele usa 5 mols.
si com 1 mol libera 1255kj, com 5 mols 6275 kj. blz. Porem o rendimento é de 80%, logo 6275 x 0.8= 5020 kj
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