Hard Chemistry Chapter 01: Solutions Class 12 Level 6

किसी विलयन में विलेय का मोल अंश 0.1 है। यदि विलायक के मोल 9 हैं, तो विलेय के मोल कितने होंगे?

In a solution, mole fraction of solute is 0.1. If moles of solvent are 9, how many moles of solute are present?

Explanation opens after your attempt
Correct Answer

B. 1 मोल / 1 mol

Step 1

Concept

Let moles of solute be x. Total moles will be x + 9.

Step 2

Why this answer is correct

Mole fraction = x ÷ (x + 9) = 0.1. So x = 0.1x + 0.9, giving 0.9x = 0.9 and x = 1 mol.

Step 3

Exam Tip

Reverse mole fraction questions can be solved using a simple equation. चरण 1: मान लें विलेय के मोल x हैं। तब कुल मोल x + ९ होंगे। चरण 2: मोल अंश = x ÷ (x + ९) = ०.१। इससे x = ०.१x + ०.९, अर्थात ०.९x = ०.९ और x = १ मोल। चरण 3: मोल अंश वाले उल्टे प्रश्नों में छोटे समीकरण से उत्तर मिलता है।

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