# Chemistry

How much heat energy, in kilojoules, is required to convert 63.0g of ice at −18.0 ∘C to water at 25.0 ∘C ?

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1. You work this in stages.
Within a phase it is
q = mass x specific heat x (Tfinal-Tinitial). For example, for liquid water at zero C to boiling it will be
q = mass H2O x specific heat liquid H2O x (100-0).
Then at a phase change (from ice to liquid or from liquid to gas it is
q = mass x heat fusion (for solid) or heat vaporization (for liquid to gas).
Then add the parts to find the total.

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2. 234

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