# Chemistry

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Calculate the heat (in kJ) required to change 40.0g of ice at -30.0 deg C to steam at 150.0 deg C?

• Chemistry -

Two formulas you need.
Within a phase is
mass x specific heat x (Tfinal-Tinitial)
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.

• Chemistry -

-760kJ cal

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