tolong plisssssssss butuh banget nih, dengan caranya ya

Tb = Tb° - ΔTb
-0,279 = 0 - ΔTb
ΔTb = 0,279

ΔTb = Kb . m
ΔTb = kb ( g x 1000)/(Mr x P)
0,279 = 1,86 ( 3 x 1000)/ (Mr x 100)
27,9 Mr = 1,86 x 3 x 1000
27,9 Mr = 5580
Mr = 5580/27,9
Mr = 200