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which has highest density NH3 Ne H2 CH4

2 answers

If all are in gas state at the same pressure and temperature then they will all have then same number of moles per liter
P V = n R T
so
n / V = P / RT
so which has the highest molar mass?
It is not H2, that is just 2 grams/mol
Ne = 21 g/mol
NH3 = 14 + 3 = 17 g/mol
CH4 = 12 + 4 = 16 g/mol
Another way to look at this is that @ STP, 1 mol of any gas will occupy 22.4 L so d = m/v
NH3 = 17/22.4 = ?
CH4 = 16/22.4 = ?
H2 = 2/22.4 = ?
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