Two moles of an unknown substance were shown to have a mass of 240g. what molecular mass does the substance have?

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible?

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

This element exists in adundance in the sun.explain how you would go about capturing sunlight.would this captured sunlight contain any of the element?