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Homework Help: Mixing steam and water

  1. Jun 22, 2017 #1
    1. The problem statement, all variables and given/known data

    The temperature of 100 gm of water is to be raised from 24°C to 90°C by adding steam to it .Calculate the mass of the steam required for this purpose .

    2. Relevant equations

    Latent heat of vaporisation of steam = 540 Cal/g
    3. The attempt at a solution

    Let 'm' be the mass of steam added.

    Heat released by steam as it condenses into
    water = 540m

    Heat released by condensed water as it moves
    from 100°C to 90°C = mx1x10 = 10m

    Total heat released = 540m+10m= 550m

    Heat required by 100gm water to raise its temp from
    24°C to 90°C = 100x1x66

    Equating the two , 550m = 6600

    m = 12gm

    Is it correct ?

  2. jcsd
  3. Jun 22, 2017 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Looks good.
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