Which equation should be used to calculate the heat change when a given molar amount of H2O is heated from 15oC to 95oC

q = m x Cp x ΔT

Explanation:

In the range of temperatures from 15°C to 95°C, water is in the liquid phase. So, the heating process is within the liquid phase and does not involve a change of phase. Therefore, the equation used to calculate the heat absorbed (q) is:

q = m x Cp x ΔT

Where m is the mass of water, Cp is the specific heat of water and ΔT is the change of temperature (in this case: 95°C - 15°C = 80°C).

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