hi there guys im doing a thermal physics question and its hard please help me and point me in the right directions please thanks.(adsbygoogle = window.adsbygoogle || []).push({});

question 1

A 50g copper calorimeter contains 250g of water at 20degrees celsius how much steam must be condensed into water if the final temperature is to reach 50degrees?

what i did i tried applying these equations

Qcold= -Qhot

MwCw(T-Tw) = MxCx(T-Tx)

i let mw=0.25g

now the tricky bit is the steam getting condensed to 50degrees i tried using the latent heat of evaporation but with no sucess and how does the copper insulator relate??? pleaes help

Question 2

An insulated vessel 250g if ice is at 0degrees and is added to 600g of water at 18degrees a) what is the final temperature of water

ok first step here i calculated the energy required to change the phase of ice to water

Q=83.3 KJ

then i calcualted the energy 600g of water released and got Q=45.2 KJ

how do i go from here to get final temperature of the system??? and the book says the answer is 0 how is that??? please show me thanks

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# Homework Help: Thermal physics hard!

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