Determine the mass of propane (C3H8) needed to fill 18.3 of space at STP

Question

Determine the mass of propane (C3H8) needed to fill 18.3 L of space at STP

Answer 1

At STP, 1 mole of an ideal gas occupies 22.4 L.

Find moles of propane needed:

18.3 L x 1 mol/22.4 L = 0.817 moles propane needed

Mass of propane needed = 0.817 moles x 44 g/mol = 35.9 g propane