If a sample of a substance contains 9.03 x 1023 representative particles, how many moles does this represent?

I believe its 10^23 u r saying
then no. of moles= 9.03*10^23/6.02*10^23=1.5mole

1. and 2. question: in which equation? or i don't understand you, 3. a), 4. c), 5. c), 6. b), 7. d), 8. d) if small number is underlined(behind symbol) , b) if big number is underlined(in front of symbol)9. what is underlined there? 10. c)