Posted by **liz** on Wednesday, August 1, 2012 at 7:20pm.

Calculate the formula wright of a 2.50 g sample of gas whose volume is 1.40l at STP.

- chem -
**DrBob222**, Wednesday, August 1, 2012 at 8:50pm
Use PV = nRT and solve for n = number of mols; then n = grams/molar mass. You know n and grams, solve for molar mass (formula weight).

OR, if you remember that a gas at STP occupies 22.4 L, then

1.40 L/22.4 = n, then n = grams/molar mass.

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