Hard Chemistry Chapter 01: Solutions Class 12 Level 6

0.2 मोल प्रति किलोग्राम विलयन बनाने के लिए 36 ग्राम ग्लूकोज को कितने किलोग्राम जल में घोलना होगा?

How many kilograms of water are needed to prepare a 0.2 mol kg-1 solution using 36 g glucose?

Explanation opens after your attempt
Correct Answer

B. 1.0 किलोग्राम / 1.0 kg

Step 1

Concept

Moles of glucose = 36 ÷ 180 = 0.2 mol.

Step 2

Why this answer is correct

Molality = moles ÷ kg of solvent. 0.2 = 0.2 ÷ mass, so mass of water = 1.0 kg.

Step 3

Exam Tip

In molality questions, calculate solvent mass in kilograms. चरण 1: ग्लूकोज के मोल = ३६ ÷ १८० = ०.२ मोल। चरण 2: मोललता = मोल ÷ विलायक का किलोग्राम द्रव्यमान। ०.२ = ०.२ ÷ द्रव्यमान, इसलिए जल का द्रव्यमान १.० किलोग्राम होगा। चरण 3: मोललता के प्रश्न में जल का द्रव्यमान किलोग्राम में ही निकालें।

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The correct answer is B. 1.0 किलोग्राम / 1.0 kg.

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