thermal physics revision

an immersion heater , in a insulated vessel of negligible heat capacity brings 100 g of water to the boiling point from 16 degrees in 7 min.

then find 1} power of heater
2}the water is replaced by 200 g alcohol, which is heated from 16 degrees to the boiling point of 78 degrees in 6 min 12 sec., 30 g are vapourised in 5 min 6 sec. find specific heat of alcohol.
3}the heat of vapourization of alcohol is ?

this was a comprehension type, but didnt want to give answers{ discouraging guess work i do}