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p = 50 gr
ΔTb = Tblarutan - Tbpelarut
= 100,5 - 100
= 0,5⁰C
ΔTb = m x Kb
0,5 = m x 0,5
m = 1
m = g/Mr x 1000/p
1 = 4,5 / Mr x 1000/50
1= 4,5 /Mr x 20
Mr = 90