Which one of the following is not the same number as the rest?

The number of molecules in 4 moles

C O_{2}

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The number of hydrogen atoms in 2 moles of

H_{2} O

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The number of chloride ions in 4 moles of

C a C l_{2}

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The number of hydrogen atoms in

\frac{1}{2}

mole of

C_{3} H_{8}

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Solution

The correct option is C The number of chloride ions in 4 moles of $C a C l_{2}$
Number of molecules in 4 moles of $C O_{2} = 4 \times 6.023 \times 10^{23}$
Number of hydrogen atoms in 2 moles of $H_{2} O = 2 \times 2 \times 6.023 \times 10^{23}$
Number of chloride ion in 4 moles of $C a C l_{2} = 4 \times 2 \times 6.023 \times 10^{23}$
Number of hydrogen atoms in $\frac{1}{2}$ moles of $C_{3} H_{8} = \frac{1}{2} \times 8 \times 6.023 \times 10^{23}$

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