[starter]

The follwoing questions are causing me problems for question number 9 i am thinking of converting the mass to moles then delta U= KJ and then subbing intot he formula Q=mc delta T

the other one i have no clue

Question 9 
In order to calibrate a constant volume bomb calorimeter, the combustion of 0.5828 g of benzoic acid, C6H5COOH, was observed to cause the temperature in the calorimeter to rise from 25.000 to 27.982 oC. The energy of combustion of benzoic acid, DU, is -3226.7 kJ mol-1.
What is total heat capacity of the calorimeter and all its contents, C / kJ oC-1?



Question 10 
In a constant pressure calorimeter, 186 mL of a 1.00 M alkaline earth metal (Me) chloride solution were added to 186 mL of a 1.00 M potassium sulphate solution. The total heat capacity of the calorimeter including all the contents was 1.75 kJ oC-1. The temperature in the calorimeter rose from 24.50oC to 27.38 oC.
calculate the enthalpy change, in kJ, for the reaction:
Me2+ (aq) + SO42- (aq) = MeSO4 (s).
Me is the alkaline earth metal in question.

[Borek]

9 - seems OK

10 - how many moles of precipitate formed? Calculate Q.