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    A laboratory determination of the specific latent heat of vaporisation of water uses a
    120 W heater to keep water boiling at its boiling point. Water is turned into steam at the
    rate of 0.050 g / s. Calculate the value of the specific latent heat of vaporisation obtained from this
    experiment. Show your working.

    How would you do this?

    I would - use the power given to tell me how much energy in Joules is supplied to the water every second.

    Then I'd use the latent heat equation, with this energy, and the mass of water turned to vapour in 1second, to calculate the latent heat. Somewhere in that second step I'd probably change the g to kg but it doesn't really matter if you don't do that - it just means your latent heat will be in J/g instead of J/Kg.
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Updated: February 26, 2018

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