Hard Chemistry Chapter 01: Solutions Class 12 Level 6

18 ग्राम ग्लूकोज को 500 ग्राम जल में घोला गया। विलयन की मोललता क्या होगी?

18 g glucose is dissolved in 500 g water. What is the molality of the solution?

Explanation opens after your attempt
Correct Answer

B. 0.2 मोल प्रति किलोग्राम / 0.2 mol kg-1

Step 1

Concept

Molality = moles of solute ÷ mass of solvent in kilograms.

Step 2

Why this answer is correct

Moles of glucose = 18 ÷ 180 = 0.1. Water = 500 g = 0.5 kg. Molality = 0.1 ÷ 0.5 = 0.2.

Step 3

Exam Tip

In molality, use mass of solvent only, not solution mass. चरण 1: मोललता = विलेय के मोल ÷ विलायक का द्रव्यमान किलोग्राम में। चरण 2: ग्लूकोज के मोल = १८ ÷ १८० = ०.१। जल = ५०० ग्राम = ०.५ किलोग्राम। मोललता = ०.१ ÷ ०.५ = ०.२। चरण 3: मोललता में विलयन नहीं, केवल विलायक का द्रव्यमान लिया जाता है।

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The correct answer is B. 0.2 मोल प्रति किलोग्राम / 0.2 mol kg-1.

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