Answer to Question #173832 in General Chemistry for John

Question

4. Calculate the enthalpy change for one mole of zinc and CuSO4(aq),

and write a thermochemical equation for the reaction.

5. Compare your result with the accepted value of -217 kJ mol^-1 by

calculating the percentage error in your answer.

6. List some possible reasons for any difference between your value and

the accepted value

Answer 1

Zn + CuSO4 = ZnSO4 + Cu

Enthalphy change of the reaction = -218.67KJ/mol

%error = -217/-218.67 × 100%= 77.89%

It could be as a result of heat lost or gained and also the calorimeter