Problem: LP gas burns according to the following exothermic reaction: C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (g) ΔH°rxn = - 2044 ( kJ)(a) What mass of LP gas is necessary to heat 1.6 L of water from room temperature 25.0°C to 100.0°C? Assume that during heating, 14% of the heat emitted by the LP gas combustion goes to heat the water. The rest is lost as heat to the surroundings.

FREE Expert Solution
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FREE Expert Solution

Recall that heat can be calculated using the following equation:

q=mcT

q = heat, J

+qabsorbs heat
–qloses heat

 m = mass (g)
 c = specific heat capacity = J/(g·°C)
 ΔT = Tf – Ti = (°C)


Calculate the mass of LP gas:


92% (434 ratings)
Problem Details

LP gas burns according to the following exothermic reaction: C3H8 (g) + 5 O2 (g) → 3 CO2 (g) + 4 H2O (g) ΔH°rxn = - 2044 ( kJ)

(a) What mass of LP gas is necessary to heat 1.6 L of water from room temperature 25.0°C to 100.0°C? Assume that during heating, 14% 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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