# A diatomic ideal gas quesion

1. Jan 28, 2008

### wowolala

1. The problem statement, all variables and given/known data

A diatomic ideal gas expands at constant pressure. What percentage of the heat supplied to the gas is used to increase the internal energy of the gas? what percentage is used to do expansion work?

i know Q=CnT, and in the diatomic ideal gas, C_p= $$\frac{7}{2}$$ R. but i am so confused that the number of moles, n is not given, and T is also is not given, how get we start with this question...

thx. can someone help me

Last edited: Jan 28, 2008