When 10g of coal is burnt it rises the temperature of 2 l water from 20°c to 55°c. Calculate the heat combustion fuel
Answers
heat of combustion of fuel is 2.94 × 10⁴ kJ/kg
10g of coal is burnt it rises the temperature of 2l water from 20°C to 55°C.
mass of 2l water , m = volume × density
= 2000 cm³ × 1g/cm³
= 2000 g = 2kg
now using formula, Q = ms∆T
= 2kg × 4200 J/kg/°C × (55°C - 20°C)
= 2 × 4200 × 35 J
= 294000 J
heat lost by fuel = heat gained by water = 294000 J
heat of combustion of fuel = heat released by fuel /mass of fuel
= 294000 J/10g
= 294000 J/10^-2 Kg
= 29400000 J/kg
= 2.94 × 10⁴ kJ/kg
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10g of coal is burnt it rises the temperature of 2l water from 20°C to 55°C.
mass of 2l water , m = volume × density
= 2000 cm³ × 1g/cm³
= 2000 g = 2kg
now using formula, Q = ms∆T
= 2kg × 4200 J/kg/°C × (55°C - 20°C)
= 2 × 4200 × 35 J
= 294000 J
heat lost by fuel = heat gained by water = 294000 J
heat of combustion of fuel = heat released by fuel /mass of fuel
= 294000 J/10g
= 294000 J/10^-2 Kg
= 29400000 J/kg
= 2.94 × 10⁴ kJ/kg