As nyou noted, this is a gas law problem.
PV=nRT, where P is pressure, n is moles, R is the gas constant, and T is temperature in Kelvin.
Rearrange to sove for P:
Make a table and enter the values:
P = (1.12
moles)*(0.0821 L*atm/ mole* K)(282 K)/23.2 L
P = 1.117 atm, or 1.12 atm to 3 sig figs