ICSE Class 10 Chemistry 2017 Solved Paper

A gas cylinder can hold 1‌kg of hydrogen at room temperature and pressure :

Question : 64

Total: 86

If the number of molecules of hydrogen in the cylinder is X , calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.

Solution:

1 mole of any gas =6.022×1023 molecules 500 mole of hydrogen
=500×6.022×1023‌ molecules ‌=X
As the number of moles of hydrogen and CO2 are the same.
The number of molecules of CO2
‌=X=500×6.022×1023
‌=3011×1023‌ molecules ‌
‌=3.011×1026‌ molecules ‌

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