Question

If bromine is available in the form of say two isotopes 79/35 Br (49.7%) and 81/35 Br (50.3%) calculate the average atomic mass of bromine atom
(i) The mass of 79/35 Br isotope is 79u and35 its abundance is 49.7%
, (ii) The mass of 81/35Br isotope is 81u and its abundance is 50.3%
79 × 49.7/100 + 81 × 50.3/100
3926.3 + 40743 = 80.006 = 80u

Answer 1

Answer:

79 × 49.7/100 + 81 × 50.3/100

3926.3 + 40743 = 80.006 = 80u.600. keeping 10 items for himself, he sold

Explanation:

entries 4, 5, 6, 7. Column 2 is labeled Tally with entries 4, 5, 3, 4..600. keeping 10 items for himself, he sold79 × 49.7/100 + 81 × 50.3/100

3926.3 + 40743 = 80.006 = 80u