If 1.00 L of an unknown gas at STP has a mass of 5.40 g,what is the molar mass?

Answer 1

To find the molar mass, we can use the following formula:

molar mass = (mass of gas) / (number of moles of gas)

At STP (standard temperature and pressure), 1 mole of any gas occupies 22.4 liters. We have 1.00 L of the gas. Therefore, we can calculate the number of moles of the gas using:

number of moles = 1.00 L / 22.4 L/mol = 0.0446 mol

Now, we can find the molar mass by plugging values into the formula:

molar mass = 5.40 g / 0.0446 mol = 121.06 g/mol

Therefore, the molar mass of the unknown gas is approximately 121.06 g/mol.