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Question

Which of the following contains greatest number of oxygen atoms?


A
1 g of O
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B
1 g of O2
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C
1 g of O3
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D
All have the same number of atoms
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Solution

The correct option is D All have the same number of atoms
Number of moles=$$\dfrac{Mass\ in\ gram}{Molar\ mass}$$

Number of moles $$=\dfrac{Number\ of\ particle}{{N}_{A}}$$
For option A
Moles of O atom=$$\dfrac{1}{16}$$

Number of O atom= $$\dfrac{{N}_{A}}{16}$$

For option B
Moles of $$O_2$$=$$\dfrac{1}{32}$$

Moles of O atom=$$\dfrac{2}{32}$$

Number of O atom= $$\dfrac{{N}_{A}}{16}$$

For option C
Moles of $$ O_3$$= $$\dfrac{1}{48}$$

Moles of O atom $$=\dfrac{3}{48}$$=$$\dfrac{1}{16}$$

Number of O atom=$$\dfrac{{N}_{A}}{16}$$

Hence all contain same number of atoms

Physics

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