How many moles are present in 0.23 kg of SO2

Multiply first the mass given in kilograms by 1000 in order to convert it to grams.

(0.23 kg) (1000 g / 1kg) = 230 g

Then, divide the mass in gram by the molar mass of SO2

molar mass of SO2 = 64.044 g/mol

Solving for the number of moles,

(230 g) (1 mol/64.044g) = 3.59 moles

Thus, there are approximately 3.59 moles of SO2 present in 0.23 kg of SO2.