Choose the correct statements from the following:

One twelfth the mass of one carbon-12 atom is  $1.66\times {10}^{-27}kg$

1 mole of any gas at 1 bar pressure and 273.15  K has a volume of  $22.71d{m}^3$

Atomic masses of elements are generally not whole numbers as naturally occurring elements are mixture of isotopes

Avogadro constant is defined as the number atoms present in exactly 0.016 g of  $O$