Explanation:
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Mass 1 + %abundance of first isotope + Mass 2 + %abundance of second isotope
/ 100
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Answer:

Explanation:
mass of Fe = 55.85 g
Molar mass of Fe = 55.85 g/mol
<u>Moles of Fe = 55.85 / 55.85 = 1</u>
mass of Cl = 106.5 g
Molar mass of Cl = 35.5 g/mol
Moles of Cl = 106.5 / 35.5 = 3
Taking the simplest ratio for Fe and Cl as:
1 : 3
The empirical formula is = 
You have to do a report :

So
the truck efficiency is 38%.
Its leading to contaminated drinking water.