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A flask with a volume of 250.0 mL contains air with a density of 1.211 g/L. What is the mass of the air contained in the flask?

Answer :

Willchemistry
250.0 mL in liters:

250.0 / 1000 => 0.25 L

D = m / V

1.211 = m / 0.25

m = 1.211 x 0.25

m = 0.30275 g



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