Which pair of substances share the same mass percent of each element?

N a O C l

and

O C l^{-}

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C O

and

C O_{2}

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C_{6} H_{12} O_{6}

and

C_{3} H_{6} O_{3}

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None of these pairs of substances share the same mass percent.

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Solution

The correct option is C $C_{6} H_{12} O_{6}$ and $C_{3} H_{6} O_{3}$
When the ratio of number of atoms in a molecule are same then the percentage of each element will be same.
Here, In $C_{6} H_{12} O_{6}$
$C : H : O = 6 : 12 : 6 = 1 : 2 : 1$
In $C_{3} H_{6} O_{3}$
$C : H : O = 3 : 6 : 3 = 1 : 2 : 1$
So, $C_{6} H_{12} O_{6}$ and $C_{3} H_{6} O_{3}$ has same percent of element.

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