Which saturated carbohydrate is lighter than air?

Answer: methane. Explanation of the solution to the problem: to solve this problem, it is necessary to compare the “weight” of air and some “light” saturated hydrocarbon. The smallest hydrocarbon is methane with the general formula CH4, its molar mass is 16 g / mol, that is, one mole of methane weighs 16 g. And the molar mass of air is 29 g / mol, that is, methane is lighter than air. Let’s check the next hydrocarbon after methane – ethane, its formula is C2H6, its molar mass is 30 g / mol, and therefore ethane is heavier than air. Therefore, the correct answer is only methane.