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Percentage Composition

A mixture con...

Question

A mixture contains $5.0 g$ of compound $X$ and $20.0 g$ of compound $Y$ .What is the percent by mass of compound $X$ ?

A

75

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B

25

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C

80

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D

20

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Solution

The correct option is B $20$
Given,
Mass of X $= 5 g = m_{x}$
Mass of Y $= 20 g = m_{y}$
$%$ Mass of X is defined as ratio of mass of X and total mass of mixture.
$%$ Mass of X $= (\frac{m_{x}}{m_{x} + m_{y}}) \times 100 = (\frac{5}{5 + 20}) \times 100 = 20 %$

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