The abundance of 79br is 50.69%. the abundance of 35cl is 75.77%. calculate the abundance of 79br35cl.

To get the overall abundance of the compound, what we have to do is to simply multiply the abundance of each element of that compound in decimal form.

50.69% = 0.5069

75.77% = 0.7577

Therefore:

0.5069 * 0.7577 = 0.3840

Therefore the abundance of 79Br35Cl is about 38.40%

38.40%

b is the correct answer

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the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)