Question

I need to know how to -Calculate the theoretical number of moles of hydrogen gas produced with the data below
SO here's the reaction
Mg(s) + 2HCl(aq)---> MgCl2(aq) + H2(g)
and the data
Mass of Mg(g)--.031g
Max Pressure(atm)--1.08atm
Initial Pressure(atm)--.83atm
Volume of flask(mL)--125mL
Pressure change(atm)--.25atm
Temperature(k)--295k