[Mikez]

I am having so much trouble with these

1. When 200g of metal at 100oc is placed in 200g of water at 15^oC, the final temp. is 23^oC. What is heat of metal (show in terms of J/g.oC).

2. A brass kilogram weight at a temperature of 90^oC is submerged in 440g of water at 10^oC. The final temp. is 24^oC. What is heat of brass (show in terms of J/g.oC).

For some reason I am having alot of trouble with these heat questions, if you have any suggestions or resouces on this topic please post them.

thanks

[xiankai]

http://www.chemicalforums.com/index.php?board=6;action=display;threadid=7599

[Mikez]

Thanks for the link but that is latent heat....and it doesn't answer my second question...

[Hunt]

Heat lost = Heat gained
-q_lost = q_gained
m_aC_a(T_ia - T_f) = m_bC_b(T_f - T_ib)

Where a and b represent 2 different substances
C : Heat capacitance
Ti : Initial temp
Tf : Final temp ( same for a and b at Eq )
m : mass ( gram )

It's a matter of forumla, and in both cases, you're required to determine C. ( J/g.C^o )

[Mikez]

Substances with a lower heat capacity will retain less heat during a heat transfer. -- is this true, because I am not sure. I am trying to make a concluding statement for my lab

[Hunt]

Substances with a lower heat capacity will retain less heat during a heat transfer. -- is this true

Yes , compared to another subtance of higher heat cap.