Question

Three isotopes of an element have mass numbers m,(m+1),(m+2).If the mean mass number is (m+0.5) then which of the following ratios may be accepted for m,(m+1),(m+2) in that order?
Options:
1) 1:1:1 2)4:1:1 3)3:2:1 4)2:1:1
Frnds can pls answer my question???

Answer 1

2)4:1:1

is the answer.

Explanantion:

Average mass = (m + 0.5) = m x 4 + (m+1) x1 + (m+2) x 1

=> (6m+3)/6