You sealed an Erlenmeyer flask that was determined to have a volume of 272.2 mL with a stopper. The density of air at 25°C is 0.001185 g/mL. Air has an effective molar mass of 28.96 g/mol. What amount of air was sealed in the flask?

Question

Chemistry

Camilla Spencer

24 April, 03:28

You sealed an Erlenmeyer flask that was determined to have a volume of 272.2 mL with a stopper. The density of air at 25°C is 0.001185 g/mL. Air has an effective molar mass of 28.96 g/mol. What amount of air was sealed in the flask?

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Answers (1)

Know the Answer?

Azaria Rowe · Answer 1

The amount of air is 11.1 mmol

Explanation:

Density shows the relation between mass and volume, so you can know the mass which has been sealed in the Erlenmayer.

Density = mass / volume

Density. volume = mass

0.001185 g/ml. 272.2 ml = 0.322 g

We have the mass now, so the molar weight determinates the mols

Mass/molar weight = mol

0.322g / 28.96 g/m = 0.0111 mol

To get a better number we can inform on milimols

Mols. 1000 = milimols