52.40 g of magnesium react with 33.19 g of oxygen gas forming

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.

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?

Someone do this for me. im really stuck