Mole ConceptHard
Question
Three isotopes of an element have mass numbers M, (M + 1) and (M + 2). If the mean mass number is
(M + 0.5), then which of the following ratio(s) may be accepted for M, (M + 1) and (M + 2) in the order?
Options
A.1: 1: 1
B.4: 1: 1
C.9: 6: 1
D.2: 1: 1
Solution
$(b)\frac{4 \times 1 + 1 \times (M + 1) - 1(M + 2)}{4 + 1 + 1} = M + 0.5$
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