Expert Chemistry Chapter 01: Solutions Class 12 Level 6

2 मोलल जलीय ग्लूकोज विलयन में ग्लूकोज का मोल अंश लगभग कितना होगा?

What is the approximate mole fraction of glucose in a 2 molal aqueous glucose solution?

Explanation opens after your attempt
Correct Answer

B. 0.035 / 0.035

Step 1

Concept

2 molal means 2 mol glucose in 1 kg water.

Step 2

Why this answer is correct

Moles of water = 1000 ÷ 18 = 55.56. Mole fraction of glucose = 2 ÷ (2 + 55.56) = about 0.035.

Step 3

Exam Tip

While converting molality to mole fraction, calculate moles of water carefully. चरण 1: २ मोलल का अर्थ है १ किलोग्राम जल में २ मोल ग्लूकोज। चरण 2: जल के मोल = १००० ÷ १८ = ५५.५६। ग्लूकोज का मोल अंश = २ ÷ (२ + ५५.५६) = लगभग ०.०३५। चरण 3: मोललता से मोल अंश में बदलते समय जल के मोल निकालना जरूरी है।

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