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How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation?

How much heat will be liberated if 8g of hydrogen burns in excess oxygen according to the following equation? 2H2 + O2→ 2H2O,∆H = -571.7KJ (H = 1)
A 1.42.9KJ
B 571.7KJ
C 1143.4KJ
D 285.9KJ

Answer is C

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