60 ग्राम हीलियम में कितने मोल मौजूद होते हैं?

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RRB ALP Previous Paper 18 (Held On: 29 Aug 2018 Shift 3)
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  1. 12 मोल
  2. 15 मोल
  3. 10 मोल
  4. 25 मोल

Answer (Detailed Solution Below)

Option 2 : 15 मोल
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  • हीलियम के ग्राम की संख्या (he) = 60 ग्राम
  • आणविक द्रव्यमान कुल प्रोटॉन और न्यूट्रॉन का योग है।
  • हीलियम का आणविक द्रव्यमान = 2 × 2 = 4
  • अब द्रव्यमान को तत्वों की संख्या से गुणा करने पर हमें प्राप्त होता है = 4 × 1 = 4
  • एक मोल अणु के कुल द्रव्यमान के बराबर है।
  • हम जानते हैं कि एक मोल हीलियम अणु के 4 ग्राम के बराबर है।
  • अब 60 ग्राम हीलियम में मोल की संख्या (n) = 60/4 है

इसलिए, n = 15 मोल

  • 60 ग्राम में मोल की संख्या 15 मोल होगी।
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