Question

calculate the percentage of oxygen in al2 (so4 )3​

Answer 1

Answer:

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Explanation:

The percentage composition of oxygen in Al_2(SO_4)_3Al

2

(SO

4

)

3

Atomic mass of aluminium= 27 g/mol

Atomic mass of oxygen = 16 g/mol

Atomic mass of sulphur = 32 g/mol

Molecular mass of Al_2(SO_4)_3Al

2

(SO

4

)

3

= 2\times 27+3\times 32+12\times 16=342g/mol2×27+3×32+12×16=342g/mol

Percentage of an element in a compound:

\frac{\text{Number of atoms of element}\times \text{Atomic mass of element}}{\text{molecular mass}}\times 100

molecular mass

Number of atoms of element×Atomic mass of element

×100

Percentage of oxygen:

\frac{12\times 16g/mol}{342g/mol}\times 100=56\%

342g/mol

12×16g/mol

×100=56%

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