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## Answers (1)

Assuming the ideal gas law applies, use PV=nRT to find n, the number of moles of the gas. Then, the molar mass can be found by dividing the given mass in grams by n.

You will need to convert the pressure to units of atm. 760 torr = 1 atm.

Applying the equation, (1 atm ) * (0.124 L) = n*(0.08206 l atm/mol k) * (121+ 273.15)K

notice that I converted volume to units of L and the temperature to units of Kelvin.

Solving for n: n = 0.00383 mol

molar mass = 0.123g/0.00383 mol = 32.08 g/mol