Question:

A mixture of $C_3H_8$ and $CH_4$ exerts a pressure of 320 mm Hg at temperature T K in a V litre flask. On complete combustion, gaseous mixture contains $CO_2$ only and exerts a pressure of 448 mm Hg under identical conditions. Hence mole fraction of $C_3H_8$ in the mixture is

Updated On: Jul 5, 2022
  • 0.2
  • 0.8
  • 0.25
  • 0.75
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The Correct Option is A

Solution and Explanation

Let V L at T K and 320 mmHg represents 1 mol Then V L at T K and 448 mmHg represents = $\frac{448}{320} $ mol = 1.4 mol $\underset{\text{x mol}}{{C_3H_8(g) }}+ SO_2(g) \rightarrow \underset{\text{3x mol}}{{3CO_2(g) }} + 4H_2O(l)$ $\underset{\text{(1-x) mol}}{{CH_4(g) }}+ 2O_2(g) \rightarrow \underset{\text{(1-x) mol}}{{3CO_2(g) }} + 4H_2O(l)$ Let moles of $C_3H_8$ = x $\therefore $ Moles of $CH_4$ = 1- x Moles of $CO_2$ produced = 3x + 1 - x = 1 + 2x 1 + 2x = 1.4 2x = 0.4 x = 0.2 Mole fraction of $C_3H_8 = \frac{x}{1}$ = 0.2
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Notes on States of matter

Concepts Used:

States of Matter

The matter is made up of very tiny particles and these particles are so small that we cannot see them with naked eyes.

There are three States of Matter:

The three states of matter are as follows:

Solid State:

  • The solid-state is one of the fundamental states of matter.
  • Solids differ from liquids and gases by the characteristic of rigidity.
  • The molecules of solids are tightly packed because of strong intermolecular forces; they only oscillate about their mean positions.

Liquid State:

  • The molecules in a liquid are closely packed due to weak intermolecular forces.
  • These forces are weaker than solids but stronger than that of gases.
  • There is much space in between the molecules of liquids which makes their flowing ability easy.

Gaseous State:

  • In this state of matter, distances between the molecules are large (intermolecular distance is in the range of 10-7-10-5 cm.
  • The intermolecular forces experienced between them are negligible.
  • Thus, translatory, rotatory and vibratory motions are observed prominently in gases.