A gas sample is compressed to pressure of 5 atomispheres in order to show a decrease in volume from 6 litre to 4 litres .The process gives out 6 cal. Of heat to surroundings.The system during the operatoin is

Options

A. `-24.8`
B. `248`
C. `-248`
D. `24.8`

Answer

B

Explanation

` Delta V = 4-6 =- 2` litre , P =5 atm..
`therefore W =- P xx Delta V =-5 xx (-2) =10 ` litre atm
But 1 Lit atm = 24.2 cal
`W = 10 xx 242 cal `
`Delta U = q+W = 6 + 242 = 248` cal