Question Detail

CHM 101 CHM 101 Past Questions Objective Question
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Question

The atomic masses of Cl (75.53%) and (24.47 %) are 34.968 amu and 36.956 amu respectively. Calculate the average atomic mass of chlorine.
Options
A 35.00
B 35.45
Correct Answer
C 35.50
D 35.55
Correct Answer

Option B is the correct answer.

Detailed Explanation

Average atomic mass is calculated as a weighted average: (fraction of isotope 1 × mass of isotope 1) + (fraction of isotope 2 × mass of isotope 2) = (0.7553 × 34.968 amu) + (0.2447 × 36.956 amu) = 26.41 amu + 9.043 amu = 35.453 amu ≈ 35.45 amu.

Hint

Calculate the weighted average, not the simple average.

Question Info

Course: CHM 101
Topic: CHM 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 1649 of 1872
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