Question

Determine how many moles are present in 0.23 kg of SO2

Answer 1

You need to use the formula:
\[Moles = mass \div molecular\ weight\]
The molecular weight of SO_2 is calculated by summing the atomic weights of each component atom:
MW = 32 + 16 + 16 (weight of S is 32. Of O is 16. You can read this off the periodic table).
MW = 64 g/mol

So to calculate number of moles:
\[Moles = 230 g \div 64 g/mol\]
Moles = 3.59 mol.