Two elements A (At. wt 75) and B(At. wt 16) combine to yield a compound. The percentage by weight of 'A' in the compound was found to be 75.08. The molecular formula of the compound is:

A_{2} B

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A_{2} B_{3}

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A B

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A B_{2}

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Solution

The correct option is A $A_{2} B_{3}$
element % At mass the relative number of atom simplest ratio
A 75.08 75 $\frac{75.08}{75}$ = 1.001 $1 \times 2$ = 2
B 24.92 16 $\frac{24.92}{16}$ = 1.55 $1.5 \times 2$ = 3
ans. $A_{2} B_{3}$

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Two elements ${XY}_{2}$ X atomic weight 75 and Y atomic weight 16 combine to give compound having 75.8% of X. The formula of the compound is

P

= 75

Q

= 16

75.8 %

P

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