A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy DeltaU of the gas in joules will be

A gas is allowed to expand in a well insulated container against a con

1.	A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy DeltaU of the gas in joules will be
Answer» `-500 J` `-505 J` `+505 J` `1136.25 J` SOLUTION :`DELTAU = q + W` For adiabatic process q = 0 `DeltaU = -w = -pDeltaV` ` = -2.5 atm (4.5 - 2.5)L` ` =-5 LATM = -5 xx 101.3 J = -506.5J`