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Some Basic Concepts of Chemistry question

2004 · Q99
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Some Basic Concepts of Chemistry question

2004 · Q99

NEETChemistrySome Basic Concepts of ChemistryMCQ+4 / −1
The maximum number of molecules is present in
  1. A
    15 L of H2 gas at STP
  2. B
    5 L of N2 gas at STP
  3. C
    0.5 g of H2 gas
  4. D
    10 g of O2 gas
View written solutionFree

Correct answer: A

At STP, 22.4 L H2

= 6.023 ×\times× 1023 molecules

15 L H2 = 6.023×1023×1522.4{{6.023 \times {{10}^{23}} \times 15} \over {22.4}}22.46.023×1023×15​ = 4.033×10234.033 \times {10^{23}}4.033×1023

5 L N2 = 6.023×1023×522.4{{6.023 \times {{10}^{23}} \times 5} \over {22.4}}22.46.023×1023×5​ = 1.344 ×\times× 1023

2 g of H2 = 6.023 ×\times× 1023

0.5 g H2 = 6.023×1023×0.52{{6.023 \times {{10}^{23}} \times 0.5} \over {2}}26.023×1023×0.5​ = 1.505 ×\times× 1023

32 g O2 = 6.023 ×\times× 1023

10 g O2 = 6.023×1023×1032{{6.023 \times {{10}^{23}} \times 10} \over {32}}326.023×1023×10​ = 1.882 ×\times× 1023

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