Question

If phosphorus is considered to contain P4 molecules, then calculate the number of moles in 100g of phosphorus.

Answer 1

(31*4)g P contains 1mol Phosphorus molecules
1 g P contains 1/(31*4) P molecules
100 g P contains 100/(31*4) P molecules = 0.87 molecules

Answer 2

100g of phosphorus contains 0.806 moles.

Explanation:

Given:

Mass of phosphorus = 100g

To find:

Number of moles in 100g of phosphorus = ?

Formula to be used:

$\text { Number of moles }=\frac{\text {Given mass}}{\text {Molar mass}}$

Calculation:

Molar mass of phosphorus is 124g (standard value)

$\text { Number of moles }=\frac{\text {Given mass}}{\text {Molar mass}}$

$\text { Number of moles }=\frac{100}{124}$

$Number of moles = 0.806$

Conclusion:

The number of moles in 100g of phosphorus is calculated as 0.806 moles.

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