What is the mass of propane, C3H8, in a 27.5 L container of gas at STP?

54 g

Explanation:

STP means 22.4L/mol

27.5/22.4=1.23(mol)

1.23 mol of C3H8=1.23*44= 54 g

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.