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CHEMISTRY

# How many molecules are in 123.2g of CO2?

First calculate the number of moles of CO2: Moles = mass/Mr Moles (CO2) = 123.2/44 = 2.8 Avogadro’s constant is the number of entities (molecules) in one mole of any substance, in other words there are 6.022 x 10^23 molecules in one mole of any substance. So in 123.2g of CO2, there are 2.8 moles So 2.8 x 6.022 x 10^23 = 1.69x10^24  Haziq Ibrahim
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