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Mm oxigeno = 32 g/mol
P = 550 mmHg
1 atm ----- 760 mmHg
x ----- 550 mmHg
x = 0.723 atm
T= 3 ºC + 273 = 276 K
R = 0.0821 atm·K / mol· L
P·V = n·R·T (LEY GENERAL DE LOS GASES)
n(moles) = masa / Mm
n = 160 g / 32 g/mol = 5 moles
V = n·R·T/ P
V = 5 moles · 0.0821 (atm·K / mol· L) · 276 K / 0.723 atm.
V = 156,70 L