denistatea = masa / volum
un mol (kmol) de gaz ocupa - in conditii normale - 22,414 litri ( m³ )
exista 56 g / 28 g/mol = 2 mol de azot
44 g / 44 g/mol = 1 mol de dioxid de carbon
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100 g gaz 3 mol gaz = 22,414 l x 3 = 67, 242 l
demnsitatea = 100 g / 67,242 litri = 1.48 g/ litru = 1,480 kg/ m³
