I am working on thermal energy for A2 physics at the moment and I have got stuck on the following question:
A 7.0 kg block of iron is heated to 750 degrees celcius. It is placed in an insulated tub containing 2.0 kg of water at 20 degrees celcius. Assuming all the water is brought to the boil rapidly, calculate the mass of water which boils off.
Specific heat capacity of water=4200Jkg^-1K^-1
Specific heat capacity of iron=220Jkg^-1K^-1
Specific latent heat of vaporisation of water=2260KJ kg^-1
Would anyone be able to help?
Thanks in advance.
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- Thread Starter
- 08-03-2013 16:59
- 08-03-2013 17:03
Is this degree level or A level?
The simple answer would be to calculate the energy of iron (750-99.9)*7*Cv, then put that energy into the water, and any left over from heating water to 99.9 degrees will go into vaporising it.
If that's a degree question, the answer would be much more involved.
- 08-03-2013 20:00
Heat given by hot iron= Heat gained by water + Latent heat of vaporisationLast edited by Lelyke; 08-03-2013 at 21:51.
(Original post by Lelyke)
- 08-03-2013 21:36
Heat given by hot iron= Heat gained by water + Latent heat of vaporisation
The idea is to help people do the problem themselves.
Just the first part would have been sufficient.
Please read the guidelines for how to answer study help questions here
- 08-03-2013 21:50
Sorry new to the forum. I'll bear that in mind next time.