An element's reactivity and other chemical properties are determined by the number of

What is the molar mass of a gas that has density of 2.054 g/l

What is the scientific name for weight?

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a.sound waves can travel though solids.    b.the waves travel from room to room via air.    c.there must be some air in the wall so the sound can travel through it.    d.sound waves change to electromagnetic waves and then back again.