Homework Help: Chemistry

Posted by Amanda on Monday, October 15, 2012 at 1:12am.

The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy (delta H comb) (in kilojoules per mole on cinnamaldehyde)

Chemistry - DrBob222, Monday, October 15, 2012 at 1:26am
heat released = q = Ccal x (delta T) and I would work in J again everywhere.
Then q/gram = q/1.283 = x
Convert to J/mol by x*molar mass and that needs to be conert to kJ/mol because of the directions in the problem.
Chemistry - Amanda, Monday, October 15, 2012 at 1:40am
So

q/1.283 = 3841(130.32)

I know you have to divide by the molar mass which I found to be 132.169 but Im not sure which number I divide it by.
Chemistry - DrBob222, Monday, October 15, 2012 at 3:19pm
No, when you have q/1.283 you have q/gram. Multiply by molar mass for q/mol, then convert to kJ/mol.

Answer this Question

Related Questions

Chemistry - The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of ...
chem - The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the ...
Chemistry - 2. When a 1.000 g sample of the rocket fuel hydrazine, N2H4, is ...
Chemistry - The complete combustion of 0.100 mol of CH4 in oxygen in a bomb ...
Chemistry - The temperature rises from 25.00 °C to 29.00 °C in a bomb ...
chemistry - When 0.558g of biphenyl (C_12H_10) undergoes combustion in a bomb ...
Chemistry - The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1...
Chemistry - The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1...
Chemistry - The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1...
Chemistry - The combustion of benzoic acid releases 26.38kJ/g and is often used ...

For Further Reading

First Name:
School Subject:
Answer: