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Question
Two elements A (At. mass 75) and B (At. mass 16) combine to give a compound having 75.8 % of A. The formula of the compound is ______.
Options
AB
A2B
AB2
A2B3
Solution
Two elements A (At. mass 75) and B (At. mass 16) combine to give a compound having 75.8 % of A. The formula of the compound is A2B3.
Explanation:
Let the total mass of the compound be 100 g
Then, the mass of A would be 75.8 g
The mass of B would be 24.2 g
Now, moles of A = `75.8/75` ≈ 1
moles of B = `24.2/16` ≈ 1.5
Hence, the required empirical formula = AB 1.5 = A2B3.
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