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ICSE Class 10 Chemistry 2017 Paper

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A gas cylinder can hold 1 kg1\ \mathrm{kg} of hydrogen at room temperature and pressure :
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Question : 64 of 86
Marks: +1, -0
If the number of molecules of hydrogen in the cylinder is XX , calculate the number of CO2\mathrm{CO}_2 molecules in the cylinder under the same conditions of temperature and pressure.
Solution:  
1 mole of any gas =6.022×1023=6.022 \times 10^{23} molecules 500 mole of hydrogen
=500×6.022×1023  molecules  =X=500 \times 6.022 \times 10^{23} \; \text{molecules} \; = X
As the number of moles of hydrogen and CO2\mathrm{CO}_2 are the same.
The number of molecules of CO2\mathrm{CO}_2
  =X=500×6.022×1023\; = X = 500 \times 6.022 \times 10^{23}
  =3011×1023  molecules  \; = 3011 \times 10^{23} \; \text{molecules} \;
  =3.011×1026  molecules  \; = 3.011 \times 10^{26} \; \text{molecules} \;
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