Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP. 30.2 g/mol
30.4g/mol
30.6 g/mol
30.0 g/mol
None of the above

30.0g/mol

Explanation:

Step 1: Given data

Mass of the gas: 0.125 gPressure (P): 1 atm (standard pressure)Temperature (T): 273.15 K (standard temperature)Volume (V): 93.3 mL

Step 2: Calculate the moles of the gas

We will use the ideal gas equation.

Step 3: Calculate the molar mass of the gas

4.16 × 10⁻³ moles correspond to a mass of 0.125 g. The molar mass of the gas is:

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