The average molar mass of chlorine is . The ratio of to in naturally occurring chlorine is close to:

Question

The average molar mass of chlorine is . The ratio of  to  in naturally occurring chlorine is close to:

Canvas Classes · Accepted Answer

Strategy:
 The atomic mass is the weighted average of the isotopic masses. Let the abundance of  be  and solve for the ratio of abundances.

Step 1: Set up the average mass equation
Let the fraction of  be . The fraction of  is .

Step 2: Determine ratio
Abundance of .
Abundance of .
Ratio .

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