Fill in the following blanks :
(a) 1 mole contains `"…………."` atoms, molecules or ions of a substance.
(b) A mole represents an `"…………."` number of particles of a substances.
(c ) 60 g of carbon element are `"…………."` moles of carbon atoms.
(d) 0.5 mole of calcium element has a mass of `"…………."`.
(e) 64 g of oxygen gas contains `"…………."` moles of oxygen atoms.

Answer

(a) `6.022 xx 10^(23)` , (b) Avogadro , (c ) 5 , (d) 20 g , (e ) 4