How many atoms are there in exactly 12 g of carbon -12 element? (C = 12 u)

Find the mass of 2 moles of oxygen atoms?

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 substance.

(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.

What name is given to this number?

What name is given to the amount of substance containing this number of atoms?