Which process requires more energy: completely vaporizing 1 kg of saturated liquid water at 1 atm pressure or completely vaporizing 1 kg of saturated liquid water at 8 atm pressure ? 8
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When a phase change occurs, the substance involved is absorbing or releasing big amounts of heat, despite that this process occurs at a constant temperature. The amount of heat required by a mass unit of a substance to change its phase is called the heat of phase change, or the enthalpy change of phase change (H). We can calculate the amount of heat transferred with the latent heat equation:Explanation:
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