When a large evacuated flask is filled with argon gas, its mass increases by 3.224 g. When the same flask is again evacuated and then filled with a gas of unknown molar mass, the mass increase is 8.102 g. (a) Based on the molar mass of argon, estimate the molar mass of the unknown gas. (b) What assumptions did you make in arriving at your answer?

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Trinidad TremblayLv2

13 May 2020

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A large flask with a volume of 936mL is evacuated and found to have a mass of 134.66 g. it is then filled to a pressure of 0.967atm at 31 C with a gas of unknown molar mass and then reweighed to give a new mass of 135.91 g. what is the molar mass of this gas.

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apricotwolf78

n this week's experiment you will determine the molar mass of carbon dioxide by measuring the mass of an Erlenmeyer flask full of the gas. The following calculations are intended to familiarize you with the general procedure:

The mass of an empty Erlenmeyer flask and stopper was determined to be 43.59 grams. When filled with distilled water, the mass was 291.1 grams. The atmospheric pressure was measured to be 0.9916 atm, the room temperature was 19.00^oC. At this temperature, the vapor pressure of water is 16.50 torr -- but assume a 50% relative humidity as outlined in the procedure for this experiment.

What is the number of moles of air in the flask?

Moles of air in the flask = mol

If the average molar mass of the gases present in air is 28.960 g mol^-1, what is the mass of air in the flask?

Mass of air in the flask = grams

What would be the mass of carbon dioxide in the flask?

Mass of carbon dioxide = grams

What would be the mass of the flask (and stopper) when filled with carbon dioxide gas? In this case the CO₂ will be saturated with water vapor so assume 100% humidity as outlined in the experiment.

Mass of flask and stopper filled with CO₂ gas = grams

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