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Question

The number of oxygen atoms in 4.4g of CO2 is approximately :

A
1.2×1023
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B
6×1022
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C
6×1023
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D
0.12×1023
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Solution

The correct option is A 1.2×1023
Moles of CO2=4.444=0.1 moles
Number of molecules of CO2=0.1×6.022×1023
=6.022×1022 molecules

But 1 molecule of CO2 contains 2 oxygen atoms.
Number of oxygen atoms=2×6.022×1022
=12.044×1022 atoms
=1.2×1023 atoms

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