This question is about fuel for heating.

A room heater burns liquid fuel and the following data are available.

$$\begin{array}{*{20}{l}} {{\text{Density of liquid fuel}}}&{ = 8.0 \times {{10}^2}{\text{ kg}}\,{{\text{m}}^{ - 3}}} \\ {{\text{Energy produced by 1 }}{{\text{m}}^{\text{3}}}{\text{ of liquid fuel}}}&{ = 2.7 \times {{10}^{10}}{\text{ J}}} \\ {{\text{Rate at which fuel is consumed}}}&{ = 0.13{\text{ g}}\,{{\text{s}}^{ - 1}}} \\ {{\text{Temperature at which air enters heater}}}&{ = 12{\text{ °C}}} \\ {{\text{Temperature at which air leaves heater}}}&{ = 32{\text{ °C}}} \\ {{\text{Specific heat capacity of air}}}&{ = 990{\text{ J}}\,{\text{k}}{{\text{g}}^{ - 1}}{{\text{K}}^{ - 1}}} \end{array}$$