How many joules of heat are produced by the combustion of 2.50 liters of acetylene, C₂H2, stored in a container at a pressure of

Question

How many joules of heat are produced by the combustion of 2.50 liters of acetylene, C₂H2, stored in a container at a pressure of 20,000 mm of Hg (torr) and temperature of 30.0°C with excess oxygen gas? (△H combustion (ethylene) = 48.24 kj/g). The equation for the combustion of acetylene is:
2C₂H₂ (g) + 5O2(g) → 4CO2(g) + 2H₂O(g)

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