Question

What’s the number of particles in 10 moles of hydrochloric acid?

(a) 6.022 x 10^22 particles

(b) 6.022 x 10^23 particles

(c) 6.22 x 10^23 particles

(d) 3.22 x 10^22 particles

This question was posed to me during a job interview.

The origin of the question is Mole Concept and Molar Masses topic in chapter Chemistry Basic Concepts of Chemistry – Class 11

Answer 1

The correct option is (a) 6.022 x 10^22 particles

To elaborate: One mole of any substance contains Avogadro’s number of particles. Its value is 6.022×10^23 atoms. But here the question is about 10 moles of a substance. So multiply the Avogadro’s number by 10. Therefore 6.022×10^23 x 10 = 6.022×10^22.