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Dinitrogen pentoxide decomposes spontaneously. A 5.750 g sample is placed in a calorimeter whose heat capacity...

Dinitrogen pentoxide decomposes spontaneously. A 5.750 g sample is placed in a calorimeter whose heat capacity is 5.57 kJ/°C. The temperature changes from 21.05°C to 18.96°C. a) According to these results, what is the molar enthalpy of decomposition of N2O5? b) Draw a potential energy diagram of this reaction. Please show your work

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Answer #1

Heat asborbed by calorimeter = specific heat of calorimeter x temperature change

                                = ( 5.57) x ( 21.05-18.96) = 11.64 KJ

This is heat given by 5.75 g N2O5

Moles of N2O% = mass/molar mass ofN2O5 = 5.75/108.01 = 0.053236

Molar enthalphy = enthalphy per mole = ( 11.64 /0.053236) = - 218.7 KJ/mol   ( -ve indicates heat released)

b)

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