First change the pressure to pascals (Pa) and then apply the Ideal Gas Equation.

101325 Pa x 1300 mmHg / 760 mmHg = 173319 Pa

The Ideal Gas Equation is

PV = nRT

V(m^3) = nRT/P

Where

n = 2. 0 moles

R = 8.31 the Gas Constant

T = Temperature in Kelvin ; 273 + 25 = 298 K

P = pressure in Pascasl ( 173319 Pa

Hence

V(m^3) = 2.0 x 8.31 x 298 / 173319

V(m^3) = 0.028575965 m^3

V = 28.575 dm^3 (Litres)

PV = nRT

(1300 / 760) (V) = (2.00) (0.08206) (298)

Solve for V.

(1300 / 760) ---> converts mmHg to atm