Can someone help show me how to calculate these chemistry problems?

Posted on 2015-10-28 13:10:00 in Chemistry by NIKOLS

1. Constant-volume calorimeters are sometimes calibrated by running a combustion reaction of known ?E and measuring the change in temperature. For example, the combustion energy of glucose is 15.57 kJ/g. When a 2.500 g sample of glucose burns in a constant volume calorimeter, the calorimeter temperature increases from 21.45 to 23.34°C. Find the total heat capacity of the calorimeter (in kJ/K).

2. It requires 120 J of heat to raise the temperature of 53.5 g of platinum from 295.0 K to 313.2 K. What is the molar heat capacity of platinum?

3. Given that the ?Horxn = -146.0 kJ, for the following reaction:

2AgNO3(aq) + Cu(s) ? Cu(NO3)2(aq) + 2Ag(s)

determine the standard enthalpy of formation, ?Hof, for: Cu(NO3)2(aq). Enter in kJ/mol.

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