Question

What mass of carbon dioxide is present in 1.00 m3 of dry air at a temperature of 25 ∘C and a pressure of 711 torr ?

Answer 1

1 m^3 = 100 cm x 100 cm x 100 cm = 1E6 cc = 1E3 L = 1000 L.

Use pv = nRT and solve for n.
You know P, V is 1000 L, R is 0.08206, T is 298
Then n = number of moles = grams/molar mass. You know molar mass is 44 and you know moles, solve for grams. Post your work if you get stuck.