1. What is the volume (L) of 3.01×10 23 molecules of carbon monoxide (CO)?

Question

2. How many molecules of SO2 are present in 0.45 grams of sulfur dioxide?

3. What volume (L) will the molecules of SO2 in question 2 occupy?

Answer 1

assuming STP,
#1 3.01/6.02 * 22.4
#2 0.45/64.06 * 6.02*10^23
#3 0.45/64.06 * 22.4

better review the topic some more.