Endothermic Reactions
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DH = mcDT
DH = 100*4.18*4.38
DH = 1831 J
DH = 1.831 kJ
In order to find the number of Joules per mole given off, I must use the number of moles of solid that I used in my experiment to multiply the value produced by substituting values into the above equation.
I used 1/18 of a mole of solid in my experiment; I must therefore multiply by 18 in order to find the number of Joules per mole.
DH = 1.831*18
DH = 32.96 kJ/mol Evaluation
The value that my teacher has given me for DH is 16.4 kJ/mol. Unfortunately, my calculated value is quite considerably larger than it should be; in fact it is more than double the predicted value. I must now try to explain why my value is so far out and offer some solutions in order to improve the experiment if I was to do it again. I must first explain that, eve ...
