Final answer:
To find how many molecules of SO3 are in 4.85x10-2 grams of SO3, calculate the number of moles using the molar mass and then multiply by Avogadro's number to convert moles to molecules.
Step-by-step explanation:
To determine how many molecules of SO3 are in 4.85x10⁻² grams of SO3, we first need to calculate the number of moles of SO3.
Using the molar mass of SO3 (80.06 g/mol), the calculation for the number of moles is:
Number of moles = mass / molar mass = 4.85x10⁻² g / 80.06 g/mol
After calculating the number of moles, we then convert moles to molecules by multiplying by Avogadro's number (6.02 x 10²³ molecules/mol).
The final calculation would be:
Number of molecules = number of moles x Avogadro's number
This gives us the total molecules of SO3 in the given mass.