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The element chlorine has two naturally occurring isotopes. About 75% of chlorine isotopes are Cl-35 and about 25% are Cl-37.
What is the average atomic mass of chlorine atoms?
A. 35.45 amu
B. 36.45 amu
C. 37.45 amu
D. 38.45 amu

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proxy4

ur answer i would beileve is a

Answer:

A) 35.45 amu

Explanation:

Average molar mass is given as

[tex]M_{avg} = \frac{n_1M_1 + n_2M_2}{n_1 + n_2}[/tex]

here we know that

[tex]n_1 = 0.75[/tex]

[tex]M_1 = 35[/tex]

[tex]n_2 = 0.25[/tex]

[tex]M_2 = 37[/tex]

now we have

[tex]M_{avg} = \frac{0.75(35) + 0.25(37)}{0.75 + 0.25}[/tex]

[tex]M_{avg} = 35.5 [/tex]

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