The mass of an unknown gas is determined to be 9.72 grams at22 degrees Celsius a

Question

The mass of an unknown gas is determined to be 9.72 grams at22 degrees Celsius and 810 mm Hg in a 5.0 L container. Whatis the molecular mass of the unknown gas? The "unknown" gas is most probably: a) methane, CH4 b) propane, C3H8 c) butane, C4H10 d) pentane, C5H12 The mass of an unknown gas is determined to be 9.72 grams at22 degrees Celsius and 810 mm Hg in a 5.0 L container. Whatis the molecular mass of the unknown gas? The "unknown" gas is most probably: a) methane, CH4 b) propane, C3H8 c) butane, C4H10 d) pentane, C5H12

Explanation / Answer

Molar mass = dRT/P where d is the density in g/L, R is theuniversal gas constant 0.0821 L-atm/mol-K, T is the temperatureexpressed in Kelvin and P is the pressure stated in atm = [(9.72 g/ 5.0 L) x 0.0821 L-atm/mol-K x (22 + 273 K)] /(810/760)atm = 44.18 g/mol = the molar mass of b) propane

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