Question

A 10-ft³ vessel of hydrogen at a pressure of 305 psia is vigorously stirred by paddles until the pressure becomes 400 psia. Determined (a) ∆U,and (b) W. No heat is transferred, cv= 2.434 Btu/lb.R

Answer 1

$\Delta U=\Delta p V=(p_2-p_1)V=434~btu,$

$W=-\Delta U=-434~btu.$