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  4. A compound contains two elements 'X' and 'Y ' in the ratio of 50 % each. Atomic mass of 'X' is 20 and 'Y' is 40. What can be its simplest formula?

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Q. A compound contains two elements $'X'$ and $'Y '$ in the ratio of $50\%$ each. Atomic mass of $'X'$ is $20$ and $'Y'$ is $40$. What can be its simplest formula?

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Solution:

Percentage of element $'X' = 50$,
mole ratio $ = \frac {50}{20} = 2.5$
Percentage of element $'Y' = 50$,
mole ratio $ = \frac{50}{40} = 1.25$
For $'X'$, simple ratio $= 2.5/1.25 = 2$
For $'Y'$, simple ratio $= 1.25/1.25 = 1$
Formula $= X_2Y$