CHEMISTRY 1414 Spring 2011 Practice Problem Set 7 Question 1 How much energy (in kJ) must be transferred to raise the temperature of a 250 mL cup of coffee from 20.5 °C to 95.6 °C? Assume that water and coffee have the same density (1.00 g/mL) and heat capacity (4.184 J/g·°C). Question 2 Sucrose (table sugar) can be burned to give carbon dioxide and water according to the following equation: C12H22O11 (s)+ 12 O2 (g)Æ12 CO2 (g)+ 11 H2O (l) ΔHrxn= - 5645 kJ/mol. What is the enthalpy change if 7.50 g of sugar is burned? Question 3 The combustion of 1.500 g of benzoic acid (C6H5CO2H) in a bomb calorimeter results in a change in temperature from 22.50 °C to 31.69 °C. Calculate the change in energy in kJ per mole of benzoic acid for this process if the heat capacity of the calorimeter is 893 J/°C.
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