Energy Needed to Heat and Vaporize Water?

Calculate the energy needed, in kJ, to heat 36 grams of water from 50 ° C to 100 °C and then to completely vaporize it to steam at 100 °C. The specific heat of water is 4.18J/(K · g) and its enthalpy change of vaporization is 40.7 kJ/mol.

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  • 2 years ago
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    (4.18J/(K · g)) x (36 g) x (100 - 50) K = 7524 J = 7.524 kJ to heat the water to its boiling point

    (36 g H2O) / (18.01532 g H2O/mol) x (40.7 kJ/mol) = 81.33 kJ to vaporize the water

    7.524 kJ + 81.33 kJ = 89 kJ total

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