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V - objętość [m3]
n - liczba moli
T - temperatura [K]
R - stała gazowa (8,314J/mol*K)
masa O2 = 32g/mol
p = 415 hPa = 41500 Pa
V = ?
n = 67,8g : 32g = 2,119 mola
R = 8,314 J/mol*K
T = 524 K
pV=nRT
41500*V = 2,119*8,314*524
41500V = 9231,5 ||:41500
V = 0,222 m3 = 222 dm3
Cm - stężenie molowe
Cm = n/V = 2,119 : 222 = 0,00955 mol/dm3
d - gęstość
d = m/V
d = 67,8g : 222dm3 = 0,305 g/dm3