Each reaction is allowed to come to equilibrium, and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. a. i2( g) ∆ 2 i( g) (volume is increased) b. 2 h2s( g) ∆ 2 h2( g) + s2( g) (volume is decreased) c. i2( g) + cl2( g) ∆ 2 icl( g) (volume is decreased)