How many atoms are in nac2c2 and what does the # stand for

sorry i could not find the answer for the first part

The symbol # is most commonly known as the number sign, hash, or pound sign.

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne