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Byju's Answer

Standard XII

Chemistry

Percentage Composition

Which of the ...

Question

Which of the following has lowest mass?

2

g atom of sulphur

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1

mole of

N_{2}

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5

moles of hydrogen

(H_{2})

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20

g of

H_{2} S

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Solution

The correct option is A $2$ g atom of sulphur
Calculating in terms of moles...
i) $2 g$ of $S$
No. of moles $= \frac{w t}{m o l . w t} = \frac{2}{32} = \frac{1}{16} m o l$
ii) $1 m o l$ of $N_{2}$
iii) $5 m o l$ of $H_{2}$
iv) $20 g$ of $H_{2} S$
No. of moles of $H_{2} S = \frac{20}{34} = \frac{10}{17}$
Order of mass:-
$5 m o l$ of $H_{2} > 1 m o l$ of $N_{2} > 20 ℊ$ of $H_{2} S > 2 g$ atom of $S$
Therefore, lowest mass is of $2 g$ atom of $S$

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