Calculate the number of oxygen molecules required to convert 7.50dm^3 of SO2 measured at s.t.p to SO3( molar volume of gas = 22.4dm^3, avogadros number = 6.02× 10^23)

Answer 1

Number of SO2 molecules in original mix = 6.02*10^23 * 7.5/22.4
need to add 1 O2 molecule for every 2 SO2 molecule so add
(6.02*10^23 * 7.5/22.4) * 0.5

Answer 2

Number of SO2 molecule in original mix = 6.02*1023 * 7.5/22.4. need to add 1 02 molecule for every 2 SO2 molecule so add (6.02*1023 * 7.5/22.4) * 0.5 =1.030,992 188=approximately; = 1.031.