Expert Chemistry Chapter 01: Solutions Class 12 Level 4

दस प्रतिशत द्रव्यमान-द्रव्यमान यूरिया विलयन का घनत्व एक दशमलव शून्य आठ ग्राम प्रति मिलीलीटर है। यूरिया का मोलर द्रव्यमान साठ ग्राम प्रति मोल है। इसकी मोलरता लगभग कितनी है?

A 10 percent mass by mass urea solution has density 1.08 g per mL. The molar mass of urea is 60 g per mol. What is its approximate molarity?

Explanation opens after your attempt
Correct Answer

A. 1.8 मोलर / 1.8 M

Step 1

Concept

Mass of 1 L solution = 1.08 × 1000 = 1080 g.

Step 2

Why this answer is correct

Urea mass is 10 percent of this, so 108 g and moles = 108/60 = 1.8.

Step 3

Exam Tip

1.8 moles in 1 L gives molarity 1.8 M. चरण 1: एक लीटर विलयन का द्रव्यमान 1.08 × 1000 = 1080 ग्राम होगा। चरण 2: विलेय यूरिया का द्रव्यमान 10 प्रतिशत के अनुसार 108 ग्राम है और मोल = 108/60 = 1.8। चरण 3: एक लीटर में 1.8 मोल होने से मोलरता 1.8 मोलर होगी।

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