How many grams of CO(g) are there in 67.0mL of the gas at 0.826atm and 30 ∘C?
PV = nRT and solve for n = number of mols.
Then n = grams/molar mass. You know molar mass and n, solve for grams.
Then n = grams/molar mass. You know molar mass and n, solve for grams.