How to find the heat

get_physical · Jun 17, 2008

Does anybody know the formula to find the amount of heat that is required to turn a mass of room temperature water into steam at 100degC?

I know it has something to do with the specific heat capacity of water.
But apparently there is also one that involves heat of vaporization of water.... ?

I'm doing a question that I'm trying to find the heat, and values of the heat capcity and heat of vaporization is given as well as temperature and mass.

I know this formula: Q= m*C*T, but I don't know how to use heat of vaporization...

THank you.

mgb_phys · Jun 17, 2008

Q=MCT is the energy needed to heat the water to 100degC
To boil a kg of water you need to add the heat of vapourisation this doesn't have a temperature change.

See http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/phase.html for a good description.

rock.freak667 · Jun 17, 2008

The amount of heat needed would be= Heat needed to raise temp. to 100C + Heat needed to change the phase of the water from liquid to gas

the latter will have the latent heat of vaporization

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How to find the heat

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