CHEM
posted by jann .
A 5.10g 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

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
(75.036.0) degC
Thus specific heat is
89.54 J/(5.10 g x (75.036.0) degC)
you will need to take care with sig figs. 
when i try the question i get an answer of 2.22
but the answer should be 0.450J/g*C 
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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