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Two elements A (at. wt. = 75) and B (at....

Two elements A (at. wt. = 75) and B (at. wt. = 16) combine to give a compound having 75-8% of A. What is the formula of the compound?

Text Solution

Verified by Experts

100 g of the compound should contain 75.8 g of A and 24.2 g of B.
Moles of `A= ("weight of A")/( "atomic wt.of A") =(75.8)/(75) =1 `
Moles of B = `("Weight of B")/("atomic wt.of B) = (24.2)/(16)=1.5 `
Thus, molar ratio of A and B in whole numbers is 2:3, and the formula is, therefore, `A_(2),B_(3)`.
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