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Molecular Mass

The heaviest ...

Question

The heaviest among the following is:

50 g

F e

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5 m o l e s

N_{2}

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0.1 g a t o m

A g

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0.1 g

C a

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Solution

The correct option is A $5 m o l e s$ of $N_{2}$
(A) $50$ g of $F e$

(B) 5 moles of $N_{2} = 5 m o l \times 28 g / m o l = 140$ g.
(C) 0.1 g atom of $A g$ $= 0.1 g a t o m \times 108 g / a t o m = 10.8$ g

(D) $0.1$ g $C a$

Hence, 5 moles of $N_{2}$ are heaviest.

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