What usally happens when two continentel plates converge

Why does his teacher ask him to balance the equation by including the correct coefficient

For the reaction c6h14(g) & longrightarrow; c6h6(g) + 4h2(g), δp(h2)/δt was found to be 2.5 x 10-2 atm/s, where δp(h2) is the change in pressure of hydrogen. determine δp(c6h14)/δt for this reaction at the same time.

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume