Chemistry
posted by Caitlin on .
Calculate the heat (in kJ) required to change 40.0g of ice at 30.0 deg C to steam at 150.0 deg C?

Two formulas you need.
Within a phase is
mass x specific heat x (TfinalTinitial)
Use that formula for ice at 30 to ice at zero, for water at zero to water at 100, for steam at 100 to steam at 150.
At the phase change.
mass x heat fusion for melting.
mass x heat vaporization for boiling.
Then add each part to find the total. 
760kJ cal