Question

how could we cause the equilibrium to shift to the left? CH4(g) + 2H2S(g) => CS2(g) + 4 H2(g) K = 2.5 x 10-3

Answer 1

The condition written below is in accordance with Lechateliers principle

Effect of Concentration- Increase in concentration of any of the product shift in a direction where it can consume it i.e- favor backward reaction (towards left)

Effect of pressure- In the given equilibrium, (mole)_product = 5 > (mole)_reactant = 3

When pressure increases volume decreases and equilibrium shifts in a direction where there is less number of moles. Since here moles of reactant is less, increase in pressure will shift the equilibrium to left.