Question

The molar mass of carbon dioxide gas is 44.0 g/mol. How many molecules are in 52.0 g of carbon dioxide gas?

Answer 1

We use Avogadro's number of $6.022\times 10^{23}$ molecules per mole to calculate the number of molecules from the number of moles represented by $52.0g$ of carbon dioxide.

The molecular weight of $CO_2$ $=44.0g/mol$

$=$$52.0g\over 44.0g/mol$ $\times$ $6.022\times 10^{23} molecules\over1mol$

$=7.117\times 10^{23} molecules of CO_2$