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  4. 116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H , O and C are 1,16 and 12 respectively. The data agrees with how many formulae of the following? (A) CH 3 COOH (B) HCHO (C) CH 3 OOCH 3 (D) CH 3 CHO

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Q. $116\, g$ of a substance upon dissociation reaction, yields $7.5\, g$ of hydrogen, $60\, g$ of oxygen and $48.5\, g$ of carbon. Given that the atomic masses of $H , O$ and $C$ are $1,16$ and $12$ respectively. The data agrees with how many formulae of the following?
(A) $CH _{3} COOH$
(B) $HCHO$
(C) $CH _{3} OOCH _{3}$
(D) $CH _{3} CHO$

JEE MainJEE Main 2022Some Basic Concepts of Chemistry

Solution:

$\% H =\frac{7.5}{116} \times 100=6.5$
$\% O =\frac{60}{116} \times 100=51.7$
$\% C =\frac{48.5}{116} \times 100=41.8$
Relative atomicities $= H \Rightarrow 6.5$
$O \Rightarrow \frac{51.7}{16}=3.25$
$C \Rightarrow \frac{41.8}{12}=3.5$
Emperically formula is approx.. $CH _{2} O$
(A) $C _{2} H _{4} O _{2}$ (B) $CH _{2} O$ relate to this formula.