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In an experiment to determine the specific latent heat of vaporization of water, steam of mass 10 g at `100^oC` is passed into 100 g of Water initially at `20^oC` in a container of negligible heat capacity. The temperature of the Water rises to `70^oC`. (Take the specific heat capacity of water as `4.2 x 10^3` J/kg/K and the boiling point of water as `100^oC`)
(i) Determine the specific latent heat of vaporization of water. (4 marks)
(ii) State two sources of error in this experiment. (2 mark)
(KCSE 2014 paper 1 question 17c)