High School

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A gaseous compound has a density of 1.37 g/L at 24.4 °C and 1.73 atm. What is the molar mass of the compound?

Molar mass: ____ g/mol

Answer :

To calculate the molar mass of a gas, use the formula involving density, temperature, and pressure. An example calculation shows how this formula is applied to find the molar mass of a gas. The gas identified in the example calculation is methane (CH4).

Density of a gas formula: The molar mass of a gas can be calculated using the formula:

Molar mass (g/mol) = (density x 22.4) / (temperature in K x pressure in atm)

Example Calculation: For a gas with a density of 0.0847 g/L at 17.0 °C and 760 torr, the molar mass would be calculated as: (0.0847 x 22.4) / (290 x 1.0) = 6.55 g/mol. The gas in this case is CH4 (methane).

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