Gas Laws

To find the molecular weight of the gas, we can use the ideal gas law and the molar volume equation. The ideal gas law is: where: is the pressure (in atmospheres), is the volume (in liters), is the number of moles of the gas, is the ideal gas constant (0.0821 L·atm/(mol·K)), is the temperature (in Kelvin). We are given:
Temperature , Pressure , Volume , Mass of the gas .
Step 1: Calculate the number of moles of gas .
From the ideal gas law:
Step 2: Use the molar mass formula to find the molecular weight.

The molecular weight is given by: Substituting the known values: Thus, the molecular weight of the gas is 28 g/mol, which corresponds to (D) 28.