Class 11th Chemistry NCERT Exemplar Solutions Class 11th Chapter Three Chemistry Some Basic Concepts of Chemistry Chemistry

120g of an organic compound that contains only carbon and hydrogen gives 330g of CO₂ and 270g of water on complete combustion. The percentage of carbon and hydrogen, respectively are

Option 1 - <p>25 and 75</p>

Option 2 - <p>40 and 60</p>

Option 3 - <p>60 and 40</p>

Option 4 - <p>75 and 25</p>

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Alok Kumar Singh | Contributor-Level 10

6 months ago

Correct Option - 1

Detailed Solution:

Number of moles of C = Number of moles of CO₂ = $\frac{330}{44}$ moles

Number of moles of H = 2 * no. of moles of H₂O = $(\frac{270}{18} * 2)$ moles

Mass of C = $\frac{330}{44} * 12$ gm = 90 gm

Mass of H = $\frac{270}{18} * 2 * 1 g m = 30 g m$

$\begin{array}{l} % o f C = \frac{90}{120} * 100 % = 75 % \\ % o f H = \frac{30}{120} * 100 % = 25 % \end{array}$

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Three 2025

Chemistry NCERT Exemplar Solutions Class 11th Chapter Three 2025

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