100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x $\times$ 10$-$2. The value of x is ____________. (Nearest integer)
[Atomic weight : H = 1.008; C = 12.00; O = 16.00]
Answer (integer)
19
Solution
C<sub>3</sub>H<sub>8(g)</sub> + 5O<sub>2(g)</sub> $\to$ 3CO<sub>2(g)</sub> + 4H<sub>2</sub>O<sub>(l)</sub><br><br><table>
<thead>
<tr>
<th>t = 0</th>
<th>2.27 mole</th>
<th>31.25 mol</th>
<th></th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td>t = $\infty$</td>
<td>0</td>
<td>19.9 mol</td>
<td>6.81 mol</td>
<td>9.08 mol</td>
</tr>
</tbody>
</table><br><br>mole fraction of CO<sub>2</sub> in the final reaction mixture (heterogenous)<br><br>${X_{C{O_2}}} = {{6.81} \over {19.9 + 6.81 + 9.08}}$<br><br>= 0.1902 = 19.02 $\times$ 10<sup>$-$2</sup><br><br>$\Rightarrow$ 19
About this question
Subject: Chemistry · Chapter: Some Basic Concepts of Chemistry · Topic: Mole Concept
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