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  4. Two elements X and Y combine in gaseous state to form XY in the ratio 1: 35.5 by mass. The mass of Y that will be required to react with 2 g of X is

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Q. Two elements X and Y combine in gaseous state to form XY in the ratio 1 : 35.5 by mass. The mass of Y that will be required to react with 2 g of X is

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Solution:

$x y$
$1 :35.5$
$\Rightarrow 1\,g$ of $\times$ reacts with $y=35.5\, g$
$2 g$ of $\times$ will react with $y=2 \times 35.5\, g$
$= 71 \,g$