What is meant by saying that 'the molecular mass of oxygen is `32`'?

What is the molecular mass of oxygen?

(a) Define atomic mass unit. What is its symbol ? (b) Define atomic mass of an element. (c ) What is meant by saying that 'the atomic mass of oxygen is 16 ' ?

what is meant by saying that metals are sonorous ?

What is meant by saying that the molality of a solution is 0.1?

What is meant by mass defect?

What is meant by abnormal molecular mass of solute?

What is meant by saying that 'air expands on heating'?