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p-cisnienie gazu
n - liczba moli
T-temperatura w K
V-objetość gazu
R-stała gazowa
R≈8,31 J/mol*K
V=15dm³=0,015m³
T=17°C=290K
m=0,64kg =640g
n=m:ma (ma=masa atomowa)
ma=32g/mol (z tablic)
n=640g:32g/mol
n=20moli
p=(20moli*8,31 J/mol*K *290K):0,015m³
p≈30413Pa=30,413hPa