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ICSE Class 10 Chemistry 2014 Paper

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A cylinder contains 68 g68\ g of ammonia gas at s.t.p.
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Question : 74 of 88
Marks: +1, -0
How many molecules of ammonia are present in the cylinder?
[N−14,H−1][\mathrm{N-14}, \mathrm{H-1}]
Solution:  
One mole of NH3\mathrm{NH}_3 contains   =6.022×1023   molecules   \;=6.022 \times 10^{23} \;\text{ molecules }\;
∴    4   moles of   NH3   contains   \therefore \;\; 4 \;\text{ moles of }\; \mathrm{NH}_3 \;\text{ contains }\;
  =4×6.022×1023\;=4 \times 6.022 \times 10^{23}
  =2.4088×1024   molecules.   \;=2.4088 \times 10^{24} \;\text{ molecules. }\;
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