A Sample of Chlorine Has Two Naturally Occurring Isotopes

question 11

Multiple Choice

A sample of chlorine has two naturally occurring isotopes. The isotope Cl-35 (mass 35.0 amu) makes up 75.8% of the sample, and the isotope Cl-37 (mass = 37.0 amu) makes up 24.3% of the sample. What is the average atomic mass for chlorine?

• A)36.0 amu
• B)35 amu
• C)36.6 amu
• D)35.5 amu
• E)35.521 amu

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Definitions:

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Average Number

A central value of a numerical set, typically calculated as the sum of the values divided by the count of numbers.

Poisson Distribution

A probability distribution used to model the number of times an event occurs in a fixed interval of time or space, assuming events occur with a known constant mean rate and independently of the time since the last event.

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