Answer:
To calculate the number of molecules in 12.3 moles of SO3, we can use the Avogadro's number, which is the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 x 10^23 atoms or molecules per mole.
To calculate the number of molecules in 12.3 moles of SO3, we can multiply Avogadro's number by the number of moles of SO3:
Number of molecules = Avogadro's number x moles of SO3
Number of molecules = 6.022 x 10^23 x 12.3
Number of molecules = 7.34 x 10^24
So there are approximately 7.34 x 10^24 molecules in 12.3 moles of SO3.