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Which of the following has the highest mass?

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One gram atom of Iron

5 moles of $N_{2}$

$10^{4}$ carbon atoms

44.8 litre of He at STP

answer is B.

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Detailed Solution

One gram atom of iron contains 56 grams of iron.

5 moles of $N_{2}$ contain 140 grams of nitrogen.

$10^{4}$ carbon atoms contain 120 grams of carbon.

44.8 Litres of He contains 8 grams of helium.

$N_{2}$ has the highest mass. Hence, the correct option is (B) 5 moles of $N_{2}$ .

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