Calculate the number of particles in the following: 46 g of Na atoms.

Explanation

Concept: MoleConcept - The quantity one mole of a substance signifies 6.022 × 10 23 number of particles of that substance which may be atoms, molecules, or ions. The quantity is a universal constant like Dozen, Gross, etc., and is known as Avogadro number, denoted by N A.after the scientist Amedeo Avogadro . Examples- In one mole of H 2, there are 6.022 × 10 23 molecules of hydrogen, and the number of atoms is 2 × 6.022 × 10 23, as one molecule of hydrogen contains two-atom each. The mass of one mole of a substance is called its Molar Mass (M) or Atomic mass expressed in grams. The volume occupied by a mole of gas is 22.4 L at NTP, called its Molar Volume. The no. of moles ( n) is calculated as = ⇒Number of particles / Avogadro’s number. To summarise, we can say, Calculation: Given: Mass of Na = 46g The molar mass of Na = 23g The number of moles of Na in 46g of Na = 46/23 = 2 moles 1 mole contains = 6.022 × 10 23 number of Na atoms. Then 2 mole will contain = 6.022 × 10 23× 2 = 12.044 × 10 23 Hence, the number of particles in 46g of Na is 12.044 × 10 23.