Multiple choice If the density of air is 1.3 g/l. The volume of 7.8 g of air is ______. 11 litre 6 litre 5 litre 4 litre Reveal answer Fill a bubble to check yourself B Correct answer Explanation Volume = mass / density = 7.8 g / 1.3 g/L = 6 L. This is a straightforward density calculation rearranged to find volume.