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mol = V x M = 0,2 x 0,5 = 0,1 mol
mol = gram/Mr
0,1 = gram/60
gram = 6
0,5 = gr / 60 ×1000 / 200
0,5 =gr / 60 × 5
30 = 5gr
gr = 30/5
gr = 6 gram
jadi urea yang dibutuhkan untuk membuat 200 ml larutan urea 0,5 M adalah sebanyak 6 gram