Chlorine exists in two isotopic forms `Cl-37` and Cl-35 but its atomic mass is 35.5. this indicates the ratio of Cl-37 and Cl-35 is appromimately

Options

A. `1:2`
B. `1:1`
C. `1:3`
D. `3:1`

Explanation

To find the approximate ratio of the isotopes Cl-37 and Cl-35 based on the given average atomic mass of chlorine (35.5), we can use the concept of weighted averages. Here’s a step-by-step solution:

### Step 1: Understand the Problem
Chlorine has two isotopes: Cl-37 and Cl-35. The average atomic mass of chlorine is given as 35.5. We need to find the ratio of these two isotopes.

### Step 2: Set Up the Equation
Let the ratio of Cl-37 to Cl-35 be represented as \( x:y \). We can express this as:
- Let \( x \) be the number of Cl-37 atoms.
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