In the forensic laboratory, a bullet found at a crime scene may be used as evide

Question

In the forensic laboratory, a bullet found at a crime scene may be used as evidence in a trial if the percentage of three metals, usually lead, tin, and antimony, is a match to the composition of metals in a bullet from the suspect's ammunition. If a bullet found at the crime scene contains 0.4-g of lead, 14.0-g of tin, and 1.2-g of antimony, what is the percentage of antimony metal in the bullet? Express your answer to the ones place and make sure to include the correct unit symbol with the answer

Explanation / Answer

Mass of antimony = 1.2g

Total mass of all metals in the bullet

= mass of lead + mass of tin + mass of antimony

= 0.4g + 14.0g + 1.2g = 15.6g

Percentage of antimony in the bullet

= (Mass of antimony metal/Total mass of metals)*100

So, percentage = (1.2g/15.6g)*100 = 7.7% = 8%

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