Which statement correctly compares the masses of subatomic particles in an atom such as carbon?

Is a pencil falling to the floor anon contact force, a force, or a contact force

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

If a solution contains 3 moles/liter of sodium chloride (nacl, made of sodium ions and chloride ions), what is the osmolarity of this solution