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March 26, 2017

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How much heat is required to warm 229 g of ice from -45.3°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?

  • Chemistry - ,

    There are two formulas you use.
    If you are within the same phase, use
    q = mass x specific heat in that phase x (Tfinal-Tinitial).
    Example. q for 25g H2O from 5 C to 95 C is
    q = mass x specific heat x (95-5) = ?

    The other is at a phase change; i.e., ice melting or water boiling to steam.
    q = mass x heat fusion for melting.
    q = mass x heat vaporization for liquid water turning to steam.

    The easiest way to do these problems is in pieces.
    ice from -45.3 to zero C.
    melt ice
    raise T from zero C to 100 C
    vaporize water.
    raise T of steam from 100 to 173.0C.
    Then add all of the q values together to find the total Q.

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