What volume would be occupied by 5.00 moles of oxygen gas at STP? (273K & 760 torrs)

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

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

Define a is a tiny pavket of energy