General formular of Gas laws (P1V1) ÷ T1= (P2V2) ÷ T2 P1 = 800mmHg, V, = 76cm3, Tr = 273 + 27 = 300k P2 = 760mmHg, V2 = ? T2= 273 + 0 = 273 (800 × 76) ÷ 300 = (760 × V2) ÷ 273 V2 = (300 × 76 × 273) ÷ (300 × 760) = 72.8 cm3 The volume of gas as S.T.P = 72.8 cm3