Practice Problems 7

Practice Problems 7 - CHEMISTRY 1414 Spring 2011 Practice...

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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: C 12 H 22 O 11 ( s ) + 12 O 2 ( g ) Æ 12 CO 2 ( g ) + 11 H 2 O ( l ) Δ H rxn = - 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 (C 6 H 5 CO 2 H) 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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Question 4 Mixing sulfuric acid H 2 SO 4 and water is highly exothermic. To measure the enthalpy change, 5.20 g of concentrated H 2 SO 4 was added to 135 g of water in a coffee-cup
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Practice Problems 7 - CHEMISTRY 1414 Spring 2011 Practice...

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