units of joules per mole. The enthalpy should be expressed in kilojoules per mol

Question

units of joules per mole. The enthalpy should be expressed in kilojoules per mole of reactant. ange e sum of Part B omb Consider the reaction C12H22011(s) +1202(g)-+12CO2(g) +11H2O0) in which 10.0 g of sucrose, C12H22O1, was burned in a bomb calorimeter with a heat capacity of 750 kJ/oC. The temperature increase inside the calorimeter was found to be 22.0°C. Calculate the change in internal energy, AE, for this reaction per mole of sucrose. Express the change in internal energy in kilojoules per mole to three significant figures. Print Assi Hints Edition, n/Shaw M59140 4/2017 AE= kJ/mol Submit My Answers Give Up Continue

Explanation / Answer

The heat absorbed by calorimeter = heat given in combustion

We can calculate the heat absorbed by calorimeter as

heat = heat capacity x rise in temperature

= 7.50kJ /C x 22.0 C

= 165 kJ

Thus the heat given in combustion = -165 kJ (negative sign indicates heat is liberated)

Now 10g of sucrose on burning gives 165 kJ of heat

1 mol =342g on burning produces = 342g/mol x 165kJ /10g

= 5643 kJ/mol heat

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