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?

Two elements A (at. wt. = 75) and B (at. wt. = 16) combine to give a c

1.	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?
Answer» SOLUTION :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)`.