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The molecular weight of Y when it is given that a gas X is five times heavier than hydrogen while the other gas Y is two times heavier than X is:

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2.5

answer is C.

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Detailed Solution

The molecular weight of Y is 20.
Given that:
X is 5 times heavier than hydrogen,

\Rightarrow

X = 5 H_{2}

Also, Y is 2 times heavier than X,

\Rightarrow Y = 2 X

Such that

X = 5 H_{2}

so by taking the molecular mass of the Hydrogen atom as 1, we will get

\Rightarrow

5 \times (2 \times 1)

\Rightarrow

10

Hence the molecular weight of X is 10.
So since

Y = 2 X

\Rightarrow Y = 2 \times 10

\Rightarrow

20

So, the molecular weight of Y is 20.

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