Question Detail
Question
Bromine consists of 50% 79Br and 50% 81Br. What is its relative atomic mass?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Ar = [(50 x 79) + (50 x 81)] /100 = (3950 + 4050)/100 = 8000/100 = 80. So the relative atomic mass of bromine is 80.
Hint
The notes provide this exact calculation example.