Question

The calorific value of natural gas is about 50 kJ/g. The amount of natural gas required to produce 50 MJ of energy is

• A.
  500 g
• B.
  1000 g
• C.
  $1\frac{1}{2}kg$
• D.
  $\frac{1}{4}kg$

Answer 1

The correct option is B

1000 g
Calorific value, $C=50kJ/g=50\times {10}^{3}J/gEnergy,E=50MJ=50\times {10}^{6}J$

Amount of natural gas, $m=\frac{E}{C}=\frac{50\times {10}^6}{50\times {10}^3}g={10}^{3}g=1000g$

Hence, the correct answer is option (b).