hi
Mw BrCl = MwCH2BrCl - MwCH2 = 128-14 = 114
114 = 35 + 79
using the ratios, out of 4 Cl atoms 3 are ³⁵Cl and 1 is ³⁷Cl so P(³⁵Cl)=3/4
out of 2 Br atoms 1 is ⁷⁹Br and 1 is ⁸¹Br so P(⁷⁹Br)=1/2
P(Mw=114) = 3/4 * 1/2 = 3/8
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