What would the volume of a gas be at 150c if had of volume of 693 ml at 45 c

T1 = 150°C = (150 + 273.15) K = 423.15K

T2 = 45°C = (45 + 273.15) K = 318K

V1 = 693mL = 693cm³

Applying Charle's law, the volume of a given gas is directly proportional to is temperature provided that pressure remains constant.

V = kT

V1 / T1 = V2 / T2

693 / 423.15 = V2 / 318

V2 = (693 * 318) / 423.15 = 520.79cm³

The new volume of the gas is 520.79cm³