How many atoms are in a 0.50 g sample of helium?

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?

Geothermal energy for industrial use is available almost anywhere. a. true b. false

How does the viscosity of magma change as magma cools?