Question

Define the term mole. Calculate the number of atoms and molecules in 124 gram of phosphorus P4 (atomic mass=31).

Answer 1

no if mole of P4 molecule = given wt/molar wt

= 124/124 = 1 mole

hence,

no of P4 molecules =mole × Avogadro constant

= 1 × 6.023 × 10²³ = 6.023 × 10²³

no of P atoms in P4 =4 × mole of P4 × Avogadro constant

= 4 × 1 × 6.023 × 10²³

= 24.092 × 10²³

= 2.4092 × 10²⁴

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