Question

Calculate the number of particles-(i) 87grams of sulphur atoms (ii) 0.34 moles of Nitrogen molecule.​

Answer 1

Answer:

(i) 16.37 × 6.022 × 10²³ atoms

(ii) 2.047 × 10²³ molecules

Explanation:

Using concept :

Number of particles in 1 mole of any species = Avogadro's number = 6.022 × 10²³

(i) Molar mass of Sulphur = 32 g

32 g of Sulphur contains = 6.022 × 10²³ atoms

1 g of Sulphur contains = (1/32) × 6.022 × 10²³ atoms

87 g of Sulphur contains = (1/32) × 87 × 6.022 × 10²³ atoms

87 g of Sulphur contains = 16.37 × 6.022 × 10²³ atoms

Thus, 87 g of Sulphur contains 16.37 × 6.022 × 10²³ atoms.

(ii) 1 mole of Nitrogen molecule = 6.022 × 10²³ molecules

0.34 moles of Nitrogen molecule = 0.34 × 6.022 × 10²³ molecules

0.34 moles of Nitrogen molecule = 2.047 × 10²³ molecules

Thus, 0.34 moles of Nitrogen contains 2.047 × 10²³ molecules.