An electric kettle with 2.0kw heating element has a heat capacity of 400jk 1.0kg of water at 20 degree celcius is placed in the kettle, the kettle is switched on and it is found that 13 minutes later the mass of water in it is 0.5kg. ignoring heat losses. Calculate the value of specific latent heat vaporization water (the specific heat capacity of water=4.2*10^3jk^-1k^1