Question

Calorific value of a fuel is 20,000 KJ/Kg .Calculate the amount of fuel required to produce 1,80,000 KJ of energy?

Answer 1

Answer:

9 kg

Explanation:

Calorific value=amount of heat /amount of fuel

20000=180000/x

x=180000/20000

x=9 kg

Answer 2

Calorific value of a fuel is 20,000 KJ/Kg.

• This means : 1 kg of fuel will undergo combustion to produce of 20,000 kJ of energy.

• In other words, caloric value refers to the amount of heat or energy produced by complete combustion of unit volume (here 1 kg) of a substance.

$total \: energy = caloric \: value \times quantity$

$\implies quantity = \dfrac{total \: energy}{caloric \: value}$

$\implies quantity = \dfrac{180000}{20000}$

$\implies quantity = 9 \: kg$

So, amount of fuel needed is 9 kg.