## Best answer

An unknown gas has a mass of 153 g and occupies 15.0 L at a temperature of 300.0 K and a pressure of 2.00 atm. What is its molar mass?M = 153g 鈰?0.082 L鈰卆tm K鈰卪ol 鈰?300.0K 2.00atm 鈰?15.0L = 125 g/mol

## People also ask

### How do you find the molecular weight of an unknown gas?

How would you find the molecular weight of an unknown gas? I would determine the mass of a fixed volume of the gas at a known temperature and pressure and then use the Ideal Gas Law to calculate the molar mass. The mass of an evacuated 255 mL flask is 143.187 g.

### How do you calculate the molar mass of a gas?

Given the following data for a gas, use the equation for the ideal gas law to calculate the molar mass. M = mRT/PV = 44.0? OK I understand now — thank you!

### What is the molar mass of a substance?

The molar mass is the mass of a substance divided by its number of moles. The unit that is used to measure the molar mass is grams per moles (g/mol). The mass of gas in a one-mole sample is equal to the molar mass of gas. If the molar mass of gas X was 40 g/mol, this means that the weight of gas X in a one-mole sample is equal to 40 grams.

### What is the mass of gas in a one mole sample?

The mass of gas in a one-mole sample is equal to the molar mass of gas. If the molar mass of gas X was 40 g/mol, this means that the weight of gas X in a one-mole sample is equal to 40 grams.