Iam clueless and i don't know how to do

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

What are transitions between a liquid and a solid called? identify which way they are transitioning

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?