Calculate the number of grams present in $0.5$ moles of acetylene.

13 g

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14 g

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16 g

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13.5 g

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Solution

The correct option is A $13 g$
$C_{2} H_{2}$ ${0.5 m o l e}$
molecular weight $= 2 \times 12 + 2 \times 1$
$= 26$
moles $= \frac{w e i g h t i n g r a m s}{m o l e c u l a r w e i g h t}$
$0.5 = \frac{w e i g h t i n g r a m s}{26}$
weight in grams $= 13 g$

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