A 50.0 g alloy sample is 50.0% silicon by mass. What is the mass of silicon in the sample?

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Multiple Choice

A 50.0 g alloy sample is 50.0% silicon by mass. What is the mass of silicon in the sample?

Explanation:
Percent by mass tells you what fraction of the total mass is made up by a component. If the alloy is 50.0% silicon and the total mass is 50.0 g, the mass of silicon is 0.50 × 50.0 g = 25.0 g. Half of 50.0 g is 25.0 g, which matches the 50% by mass. The remaining 25.0 g would be other elements. The other options correspond to different fractions: 10.0 g would be 20%, 50.0 g would be 100%, and 0.0 g would be 0%.

Percent by mass tells you what fraction of the total mass is made up by a component. If the alloy is 50.0% silicon and the total mass is 50.0 g, the mass of silicon is 0.50 × 50.0 g = 25.0 g. Half of 50.0 g is 25.0 g, which matches the 50% by mass. The remaining 25.0 g would be other elements. The other options correspond to different fractions: 10.0 g would be 20%, 50.0 g would be 100%, and 0.0 g would be 0%.

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