Find the mass, in grams, of 1.00 x 1023 atoms of cobalt.

Idon’t understand this page, can someone ?

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?

Identify the electromagnets with poles that are reversed from the electromagnet shown above