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n=pV/RT
R=8,31
p=228 hPa
T=25 + 273 = 298 K
V = 900 dm3
n= 900*228/298*8,31 = 205200/2476,38=82,86 mola
M(argon) = 39,9 g/mol
masa = 82,86*39,9=3306,11g
gestość = m/V= 3,67 g/dm3