ThermochemistryMedium

Question

A geyser, operating on LPG (liquefied petroleum gas) heats water flowing at the rate of 3.0 litres per minute, from 27°C to 77°C. If the heat of combustion of LPG is 40,000 J/g, then how much fuel (in g) is consumed per minute? (Specific heat capacity of water is 4200 J/kg-K)

Options

A.15.25
B.15.50
C.15.75
D.16.00

Solution

Heat released by constitution of LPG = Heat absorbed by water

w × 40000 = 3 × 4200 × 50 ⇒ w = 15.75 gm

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