Question

What is the molar mass of sulfur hexafluoride gas if the density is 22.4g/L at STP?

Answer 1

To determine the molar mass of sulfur hexafluoride gas at STP, multiply the given density of 22.4 g/L by the molar volume, which is 22.4 L/mol, resulting in a molar mass of 501.76 g/mol.

Step-by-step explanation:

Calculating Molar Mass from Gas Density

To calculate the molar mass of sulfur hexafluoride gas using its given density at STP (standard temperature and pressure), we can use the known molar volume of a gas at STP. The molar volume at STP is 22.4 L/mol, which is the volume one mole of any gas occupies under these conditions. Since the density of sulfur hexafluoride is provided as 22.4 g/L, we can use the following relationship to calculate the molar mass:

Molar mass (MM) = density × molar volume

MM = 22.4 g/L × 22.4 L/mol

MM = 501.76 g/mol

Therefore, the molar mass of sulfur hexafluoride gas is 501.76 g/mol.

Answer 2

The formula of sulfur hexafluoride gas is SF6. The molar mass only relates with formula, no matter under what condition. So the molar mass equals to 32+19*6 = 146 g/mol.