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Which of the following amount of sodium(in grams) will have the same number of atoms as $6$ g of magnesium?

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5.75

6.2

12

10.11

answer is A.

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Detailed Solution

5.75

grams of sodium will have the same number of atoms as

6

g of magnesium.
Let the mass of sodium

\Rightarrow x

Number of moles of sodium

\Rightarrow \frac{x}{23}

moles in

6

g of magnesium is

\Rightarrow

6 / 27 moles

\Rightarrow 0.25 moles

Number of atoms in

0.25

moles of magnesium = Number of atoms in

\frac{x}{23}

sodium so, their moles will also be the same
Now,

\Rightarrow 0.25 = \frac{x}{23}

\Rightarrow x = 23 \times 0.25

\Rightarrow x = 5.75

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