Expert Chemistry Chapter 01: Solutions Class 12 Level 4

एक विलयन का घनत्व एक दशमलव दो ग्राम प्रति मिलीलीटर है और उसमें द्रव्यमान के आधार पर बीस प्रतिशत विलेय है। यदि विलेय का मोलर द्रव्यमान साठ ग्राम प्रति मोल है, तो विलयन की मोलरता कितनी होगी?

A solution has density 1.2 g per mL and contains 20 percent solute by mass. If the molar mass of solute is 60 g per mol, what is the molarity of the solution?

Explanation opens after your attempt
Correct Answer

A. 4 मोलर / 4 M

Step 1

Concept

Mass of 1 L solution = 1.2 × 1000 = 1200 g.

Step 2

Why this answer is correct

Solute mass is 20 percent of this, so it is 240 g and moles = 240/60 = 4.

Step 3

Exam Tip

Since this is in 1 L solution, molarity is 4 M. चरण 1: एक लीटर विलयन का द्रव्यमान 1.2 × 1000 = 1200 ग्राम होगा। चरण 2: विलेय का द्रव्यमान 20 प्रतिशत के अनुसार 240 ग्राम है, इसलिए मोल = 240/60 = 4। चरण 3: एक लीटर विलयन में 4 मोल हैं, इसलिए मोलरता 4 मोलर है।

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