Homework Help: CHEM

Posted by jann on Monday, May 16, 2011 at 12:38am.

A 5.10-g sample of iron is heated from 36.0oC to 75.0oC. The amount of energy required is 89.54 J. The specific heat capacity of this sample of iron is

CHEM - Dr Russ, Monday, May 16, 2011 at 12:55am
The specific heat of a substance is the amnout of heat required to raise the temperature of 1 g of the substance by 1 degC.

So temperature change is
(75.0-36.0) degC

Thus specific heat is
89.54 J/(5.10 g x (75.0-36.0) degC)

you will need to take care with sig figs.
CHEM - jann, Monday, May 16, 2011 at 1:18am
when i try the question i get an answer of 2.22
but the answer should be 0.450J/g*C
CHEM - DrBob222, Monday, May 16, 2011 at 12:16pm
You must be punching in the wrong numbers on the calculator. Just estimating
(90/5*40) = 90/200 = about 0.9/2 = about 0.45

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