A geyser heats water flowing at a rate of 2.0kg per minute from 30 °C to 70 °C. if geyser operates on a gas burner the rate of combustion of fuel will be ____ g min^-1 (Heat of combustion = 8 x10³Jg^-1 Specific heat of water = 4.2Jg-¹ °C^-1)

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Detailed Solution

heat absorbed by water per min= 2 x 4200 x 40 =336000J
Now, 8 x 10³ J of heat is produced by 1gm .
So, 336000J of heat is produced by 1gm
$= \frac{1}{8 \times 10^{3}} \times 336000 gm$
So, rate of combustion=42gm/min.

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