Find the total number of oxygen atoms in 200 formula units of $N a_{2} S O_{4}$ .

800

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600

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1200

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1600

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Solution

The correct option is A 800
Number of O-atoms in one formula unit of $N a_{2} S O_{4} = 4$
So, number of O-atoms in 200 formula units of $N a_{2} S O_{4} = 200 \times 4 = 800$

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