Question

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.

Answer 1

1) 6.022×10^23

2) 6.022×10^23

3) 5

4)20g

5)4 moles

Answer 2

5 Moles of Carbon Atoms have 60 g of Carbon Element

Explanation:

(a) $6.022\times10^2^3$ is the number of atoms/molecules or ions.

(b) Avogadro number signifies a number of particles in a mole

(c) 5 moles of carbon atoms is equal to 60 g of carbon element

(d) 20 g is the mass of calcium of 0.5 moles.

(e) 4 moles of oxygen atoms have 64  g of oxygen gas.