Expert Chemistry Chapter 01: Solutions Class 12 Level 6

12 प्रतिशत द्रव्यमान आयतन सोडियम क्लोराइड विलयन के 250 मिलीलीटर में सोडियम क्लोराइड के मोल कितने होंगे? मोलर द्रव्यमान 58.5 ग्राम प्रति मोल है।

How many moles of sodium chloride are present in 250 mL of 12 percent mass by volume sodium chloride solution? Molar mass is 58.5 g per mol.

Explanation opens after your attempt
Correct Answer

B. 0.513 मोल / 0.513 mol

Step 1

Concept

12 percent mass by volume means 12 g solute in 100 mL solution.

Step 2

Why this answer is correct

In 250 mL, mass = 12 × 250 ÷ 100 = 30 g. Moles = 30 ÷ 58.5 = about 0.513.

Step 3

Exam Tip

Convert mass by volume percent into grams first, then find moles. चरण 1: १२ प्रतिशत द्रव्यमान आयतन का अर्थ है १०० मिलीलीटर विलयन में १२ ग्राम विलेय। चरण 2: २५० मिलीलीटर में द्रव्यमान = १२ × २५० ÷ १०० = ३० ग्राम। मोल = ३० ÷ ५८.५ = लगभग ०.५१३। चरण 3: द्रव्यमान आयतन प्रतिशत को पहले ग्राम में बदलें, फिर मोल निकालें।

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