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NEET 2021

Exam: NEET
Year: 2021
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry

NEET 2021 · Chemistry · Some Basic Concepts of Chemistry

An organic compound contains 80 % (by wt.) carbon and remaining...

An organic compound contains

80 %

(by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of

C

is

12

and of

H

is

1

]

Options

A $CH$
B ${CH}_{2}$
C ${CH}_{3}$
D ${CH}_{4}$

Correct answer

C. ${CH}_{3}$

Step-by-step solution

$%$ by weight $\begin{cases}C & H \\ 80 & 20\end{cases}$

$%$ by moles $\begin{cases}\dfrac{80}{12} & \dfrac{20}{1} \\ 6 . 67 & 20\end{cases}$

Simplest ratio $\begin{cases}\dfrac{6 . 67}{6 . 67} & \dfrac{20}{6 . 67} \\ 1 & 3\end{cases}$

Hence, the empirical formula of this compound is ${CH}_{3} .$

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