Expert Chemistry Chapter 01: Solutions Class 12 Level 4

नब्बे ग्राम जल में छियालीस ग्राम एथेनॉल मिलाया गया। एथेनॉल और जल के मोलर द्रव्यमान क्रमशः छियालीस और अठारह ग्राम प्रति मोल हैं। एथेनॉल का मोल अंश क्या होगा?

46 g ethanol is mixed with 90 g water. Molar masses of ethanol and water are 46 and 18 g per mol respectively. What is the mole fraction of ethanol?

Explanation opens after your attempt
Correct Answer

A. 1 / 6

Step 1

Concept

Moles of ethanol = 46/46 = 1 and moles of water = 90/18 = 5.

Step 2

Why this answer is correct

Total moles = 6, so mole fraction of ethanol = 1/6.

Step 3

Exam Tip

Mole fraction is given by mole ratio, not mass ratio. चरण 1: एथेनॉल के मोल = 46/46 = 1 और जल के मोल = 90/18 = 5। चरण 2: कुल मोल = 6, इसलिए एथेनॉल का मोल अंश = 1/6। चरण 3: द्रव्यमान नहीं, मोलों का अनुपात मोल अंश देता है।

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