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Mass Percentage

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Question

Calculate the percentage of pure aluminium in 10 kg of aluminium oxide $[A l_{2} O_{3}]$ of 90 % purity.
[Al=27, O=16]

90 %

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23.94 %

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47.64 %

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94.58 %

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Solution

The correct option is D 47.64 %
As sample is 90 % pure only so, mass of $A l_{2} O_{3} = 9 k g$
Mass of Al $= 2 \times 27 \times 9 / 102 = 4.76 k g$
% of Al in sample $4.76 \times 10 / 100 = 47.6$ %

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Similar questions

10 k g

{A I}_{2} O_{3}

90 %

47.64 %

0.051 g

({A l}_{2} O_{3})

A l

O

C

C O_{2}

N a

N a C O_{3}

A l

C = 12, O = 16, H = 1, N a = 23, A l = 27, N = 14

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