On complete combustion 1.0 g of an organic compound ( X ) gave 1.46 g of CO 2 and 0.567 g of H 2 O . The empirical formula mass of compound ( X ) is \ \ \ \ \ g. (Given molar mass in g mol -1 C : 12, H : 1, O : 16 )

Chemistry · Some Basic Concepts of Chemistry (Mole Concept) + Stoichiometry

JEE Main 2025 — 2 April, Morning Shift — Question 12

On complete combustion 1.0 g of an organic compound ( X ) gave 1.46 g of $\mathrm{CO}_{2}$ and 0.567 g of $\mathrm{H}_{2} \mathrm{O}$ . The

empirical formula mass of compound ( X ) is $\_\_\_\_\_$ g. (Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{O}: 16$ )

Option A:
30
Correct
Option B:
60
Option C:
15
Option D:
45

Answer: A

Step-by-step solution

$\%$ by mass of $\mathrm{C}=39.8$

$\%$ by mass of $\mathrm{H}=6.3$

$\%$ by mass of $\mathrm{O}=53.9$

Emperical formula $=\mathrm{CH}_{2} \mathrm{O}$

Emperical formula mass of $(\mathrm{X})=30 \mathrm{~g}$

Answer key and solution verified before publishing.

Practise Some Basic Concepts of Chemistry (Mole Concept) + Stoichiometry

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Solve a similar one free

Exam: JEE Main 2025
Paper: 2 April, Morning Shift
Subject: Chemistry
Chapter: Some Basic Concepts of Chemistry (Mole Concept) + Stoichiometry
Topic: Percentage composition & Empirical Formula

Answer: A

Step-by-step solution

Practise Some Basic Concepts of Chemistry (Mole Concept) + Stoichiometry

More Some Basic Concepts of Chemistry (Mole Concept) + Stoichiometry questions from this paper