Question

A 2.75-L flask is filled with propane gas (C3H8), at 1.00 atm and -19.4°C. What is the mass of the propane in the flask?

Answer 1

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One mole of propane weighs 44 g

One mole of propane occupies 22.4 L

no. of moles = 2.75/22.4 = 0.123 moles

Mass of propane = 0.123 x 44 = 5.412 g

Since melting point of propane is  -188 ⁰C, it will be a gas at -19.4⁰C