Question

Calculate the mass of $0.72$ gram molecules of $C{O}_2$.

Answer 1

The gram formula mass of a compound is the amount of that compound that has the same mass in grams as the formula mass in atomic mass unit. An atom of each element has a characteristic mass and in like manner each molecule of a compound has a characteristic formula mass.

When the formula mass of an ionic compound is determined by the addition of its component atomic masses and expressed in grams, it is called the Gram Formula Mass.

Let's apply mole concept.

Molar mass of $C{O}_2=12+16\times 2=44gmo{l}^{-1}$

So mass of 1 mole = 44g

Therefore mass of 0.72 moles = $44\times 0.72=31.68g$