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G = massa(gram)
Mr = you know lah
p = pelarut(volume air)(mL)
10^-5 = G/143,5 x 1000/250
10^-5 = G/143,5 x 4
1/4 x 10^-5 = G/143,5
0,25 x 10^-5 x 143,5 = G
G = 4 x 10^-4 Gram