anonymous

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At 1 atm, how much energy is required to heat 55.0 g of H2O(s) at –20.0 °C to H2O(g) at 163.0 °C?

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  • anonymous -

    It is best to do this in parts.

    For changes in temperature WITHIN a phase, calculate q using

    q = mass x specific heat x (Tfinal-Tinitial)

    For example for liquid water at zero C to liquid water at 100 C. use
    q = 55.0g x 4.184 J/g*C x (100-0) = ?

    For q at a phaae change use
    q = mass x heat fusion at melting point or
    q = mass x heat vaporization at boiling point.

    For esample, for water to change from solid at zero C to a liquid at zero C
    Q = 55.0 x 334 J/g

    Go through for 55.0 g H2O at -20 to zero, change to liquid, go from zero to 100, change to vapor, go from 100 to 163.0.
    Then add all of the individual q values together.

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