How many moles are in 2.91 X 10^22
atoms of He?

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?

Air can be considered a mixture. which statement does not explain why?

The point along a planet's orbit where it is closest to the sun is called the