PV= nRT

Pressure x Volume = number of moles x gas constant x Temperature in Kelvin

Moving things around, V/T = (nR)/P

n is not changing

R is a constant, and is not changing.

P is not changing.

So, (nR)/P is staying constant.

Meaning that, as the temperatures changes, we can say that V_{1}/T_{1} = V_{2}/T_{2}

Temperature in Kelvin = Temperate in Celcius + 273

50/298 = V_{2}/308

Cross -multiply:

(50 x 308)/298 = 51.7 L