LP gas burns according to the exothermic reaction:

What mass of LP gas is necessary to heat 1.5 L of water from room temperature (25.0 °C) to boiling (100.0 °C)? Assume that during heating, 15% of the heat emitted by the LP gas combustion goes to heat the water. The rest is lost as heat to the surroundings.

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C3Hg(g) + 5 O2(g) 3 CO2(g) + 4H2O(g) ΔΗxn = –2044 kJ