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Verified answer
Cari molalitasdelta T = kb x m
0.1 = 0.5 x m
m = 0.2 m
cari massa
m = massa ter/Mr x 1000/massa pel
0.2 = massa ter/342 x 1000/250
massa terlarut = 0.2 x 342 x 250 / 1000
massa terlarut = 17.1 gram