Answer :
Final answer:
The mass percent of chlorine in hydrochloric acid is computed by dividing the atomic mass of chlorine by the total mass of hydrochloric acid and multiplying the result by 100. This gives 97.2%, so the correct answer to the question is C) 97.2.
Explanation:
The mass percent of an element in a compound is calculated by dividing the atomic mass of that element by the total mass of the compound and then multiplying the result by 100. Hydrochloric acid (HCl) consists of hydrogen and chlorine. The atomic mass of hydrogen (H) is approximately 1 atomic mass unit (amu) while that of chlorine (Cl) is approximately 35.5 amu.
Therefore, to find the mass percent of chlorine in hydrochloric acid, you would use the following calculation: (35.5/(1+35.5)) x 100 = 97.2%.
So, the correct answer is C) 97.2.
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