What volume would be occupied by 100.0 g of oxygen gas at a pressure of 1.50 atm and a temperature of 25°C?

Apump contains 0.5 l of air at 203 kpa.you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.