Find the mass in grams of a 240 ml sample of dry air at a pressure of 750 mmHg and a temperature of 19 degrees celsius.

Answer 1

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Use PV = nRT as in your other post and solve for n = number of mols. Then n = grams/molar mass. You know n and molar mass, solve for grams.
Post your work if you need further assistance.

Answer 2

how can find mass in gram