Question

If the pressure increases by half in C2H2 + O2 ⇆ CO2 + H20 ΔH = +

Answer 1

$2 C_2H_2 (g) + 5 O_{2 (g)} \to4 CO_{2 (g) }+ 2 H_2O_{(g)}$

If the pressure in the mixture/reaction increases by half, the rate of formation of the reactants would increase (by half).