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It takes 330 joules of energy to raise the temperature of 24.6 g of benzene from 21 degrees Celsius to 28.7 degrees Celsius at constantpressure. What is the molar hear capacity of benzene at constantpressure?

Respuesta :

tutorAnne

Answer: Molar heat capacity C = 136.09 JK-1mole-1

Explanation:

Heat capacity,  C = Q/ ΔT

where C = heat capacity

Q =heat energy=  Q = 330 J

ΔT is temperature difference =Change in temp =

ΔT = (28.7  +273)-( 21 + 273)= 7.7 K

But

No. of moles of benzene= mass / molar mass

  = 24.6g / 78.11g/mol

     = 0.3149 moles

Molar heat capacity C = Q/ nΔT

                             = 330 / ( 0.3149 x 7.7 )

                             = 136.09 JK-1mole-1

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