How much hear must be added to 1.5kg of water at -25degC to raise it up to 119degC?
I think you mean heat, not hear.
Add the heat required for the following steps:
(1) heat ice from -25C to 0 C
(2) melt the ice
(3) heat water from 0 C to 100 C
(4) vaporize the water to steam
(5) heat the steam from 110 C to 119 C. (Assume constant pressure)
You will need the specific heats of ice, water and steam.
You will also need the latent heats of fusion and vaporization.
Show your work for further assistance, if needed.