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There are different heat capacities for different states, so you need to know the waters's state. Also, you have molar heat capacity as well as specific heat capacity, and the one you choose depends on the units of your given information.
Bouncing off of the last commenter, the problem should give you which phase the water is in. If it it transitioning from phase to phase, you would have to use either the enthalpy of fusion or the enthalpy of vaporization.
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