We use Avogadro's number of 6.022×1023 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 CO2 =44.0g/mol
=44.0g/mol52.0g × 1mol6.022×1023molecules
=7.117×1023moleculesofCO2
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