How many moles are in 17.50g of so2

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?