The proton number?
number of protons
Answer:
18kcal
Explanation:
Melting enthalpy of water: 80 cal/g
The melting enthalpy discribes how much heat is needed to melt a substance. So you get the heat by multiplying the mass of your substance with its melting enthalpy.
225g*18cal/g=18000cal=18kcal
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