An Ideal Gas Initially at 100^oC and Pressure P₁ =

An ideal gas initially at 100^oC and pressure P₁ = 250 kPa occupies a volume V₁ = 4.5 L. It undergoes a quasi-static, isothermal expansion until its pressure is reduced to 150 kPa. How much does the internal energy of the gas change during this process? R = 8.314 J/mol · K = 8.206 L · atm/mol · K.

A) 116 J
B) 320 J
C) 575 J
D) 640 J
E) The internal energy does not change during this process.