1.95 g of an unknown gas at STP fills a 500. mL flask. What is the molar mass of the gas?

The gas has a molar mass of around 87.4 g/mol

Explanation:

At STP, all gases are known to have the same molar volume of 22.4 L/mol.  Since we know the volume (500. mL, or 0.500 L) and mass (1.95 g) of this particular gas, we can use stoichiometric conversion to find the molar mass.

We first convert the volume into moles.

Then we find the ratio between the mass and moles to find molar mass.

d.) the average kinetic energy of the gas particles is greater in container b because its particles move faster.

thats a little if u want the answer just look it up on google thats what i do haha : )