Expert Chemistry Chapter 01: Solutions Class 12 Level 6

15 ग्राम विलेय को घोलकर 300 मिलीलीटर विलयन बनाया गया। यदि विलेय का मोलर द्रव्यमान 75 ग्राम प्रति मोल है, तो विलयन की मोलरता कितनी होगी?

15 g solute is dissolved to make 300 mL solution. If molar mass of solute is 75 g per mol, what is the molarity of the solution?

Explanation opens after your attempt
Correct Answer

C. 0.67 मोल प्रति लीटर / 0.67 mol L-1

Step 1

Concept

Moles of solute = 15 ÷ 75 = 0.2 mol.

Step 2

Why this answer is correct

Volume 300 mL = 0.3 L. Molarity = 0.2 ÷ 0.3 = about 0.67 mol L^-1.

Step 3

Exam Tip

In molarity, use final solution volume in litres. चरण 1: विलेय के मोल = १५ ÷ ७५ = ०.२ मोल। चरण 2: आयतन ३०० मिलीलीटर = ०.३ लीटर। मोलरता = ०.२ ÷ ०.३ = लगभग ०.६७ मोल प्रति लीटर। चरण 3: मोलरता में अंतिम विलयन का आयतन लीटर में ही लें।

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