Assuming the gas is ideal, we use the formula
ρ = P*MM / RT
where
ρ = density (g/L)
P = pressure (atm)
MM = molar mass (g/mol)
R = gas constant = 0.0821 L-atm/mol-K
T = temperature (K)
Note that this formula is just derived from the ideal gas law (PV = nRT).
Convert the given units to the appropriate units, then substitute:
MM = ρRT / P
MM = 1.053 * 0.0821 * (25+273) / (752/760)
MM = 26.04 g/mol
Hope this helps~ :3
A certain gas has a density of 1.053 g/L at 25C and 752 mmHg. What is the molar mass of this gas?
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1 answer