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ICSE Class 10 Chemistry 2013 Solved Paper

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O2 is evolved by heating KClO3 using MnO2 as a catalyst
2KClO3
MnO2
─────▸
2‌KCl+3O2
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Question : 78
Total: 84
Calculate the number of moles of oxygen present in the above volume and also the number of molecules.
Solution:  
245g of KClO3 contains
=3‌ moles of oxygen ‌
∴24.5g of KClO3 contains
‌=‌
3×24.5
245
‌=0.3‌ mole. ‌ Ans.
Since, 1 mole of oxygen contain
=6.022×1023‌ molecules ‌
Therefore, 0⋅3 mole of oxygen contain
‌=6.022×1023×0.3
‌=1.8066×1023‌ molecules ‌
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