A scientist is finding the specific latent heat of vaporisation of a liquid. He places the liquid in a vacuum flask and warms it using a $100\ \text{W}$ heater. When the liquid begins to boil, the mass in the vacuum flask is $300\ \text{g}$. He keeps heating the liquid for another $12\ \text{min}$, and then the mass of liquid left is $100\ \text{g}$. What is the specific latent heat of vaporisation of the liquid? (Assume that all the thermal energy from the heater is used to vaporise the liquid.)
- A$6000\ \text{J kg}^{-1}$
- B$240\ 000\ \text{J kg}^{-1}$
- C$36\ 000\ \text{J g}^{-1}$
- D$360\ 000\ \text{J kg}^{-1}$