Question

Calculate the number of moles of phosphorus (P)
atoms in 100 g of phosphorus. If phosphorus is
considered to contain P4 molecules, then how many
moles of P4 molecules are there?
​

Answer 1

Answer:

100g of phosphorus contains 0.806 moles.

Explanation:

Mass of phosphorus substance(given mass) = 100g

Atomic mass of 1 Phosphorus atom = 31

Phosphorus molecule is polyatomic and has 4 atoms in a molecule.

∴ Atomic mass of Phosphorus molecule = 31 × 4

Mole = Given mass (m) / Molar mass (M)

         = 100 / 31 × 4

         = 0.806 moles.

Hence 100g of phosphurus contains 0.806 moles of it.

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