How many molecules are in 165 g of carbon dioxide? a) 6.774 × 1024 b) 2.258 × 1024 c)2.258 × 1025 d) 6.774 × 1024

Answer

Hi, the correct answer option is

B. 2.258×10^24 molecules of CO2

Explanation

The molar mass of CO2 is 44 grams per mole

165 /44 grams  per mole of CO2 =3.75 moles of CO2

But we know from Avogadro’s law that 1 mole of a substance=6.023×10^23 molecules

Thus 3.75 moles of CO2 = (6.023×10^23  molecules/mole)= 2.258×10^24 molecules of CO2

Hope this helps!

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