Can anyone please help me with the following question?
"The following system was allowed to reach equilibrium at 300 Celsius
2HI(g) --> H2(g) + I2(g) delta H= -53 kj/mol
(colorless) (colorless) (purple)
The equilibrium mixture at 300 Celsius was compressed in a gas syringe to occupy a smaller voluem. What would be seen immediately?
a) no visible change
b) the color gets lighter
c) the mixture turns colorless
d) the mixture goes darker purple
The correct answer is D, I don't understand why can anyone please explain?