Multiple choice

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

  1. $75$
  2. $25$
  3. $80$
  4. $20$
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D Correct answer
Explanation

Total mass = 5.0 + 20.0 = 25.0 g. Percent of X = (5.0 / 25.0) * 100 = 20%.

AI explanation

To find the percent by mass, divide the mass of compound X by the total mass of the mixture and multiply by 100. The total mass is 5.0 g plus 20.0 g, which is 25.0 g. Therefore, the calculation is (5.0 divided by 25.0) times 100, resulting in 20 percent.

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