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Verified answer
Ppb = m terlarut / m pelarut × 10^99,4 = m terlarut / m pelarut × 10^9
m terlarut = 9,4 × 10^-9 m pelarut
Jadi dapat disimpulkan terdapat 9,4 × 10^-9 gram zat terlarut dalam 1 gram zat pelarut ( air )
massa jenis air = 1 gr / mL
massa air = mj × V = 1 gr/mL × 25 mL = 25 gram
m terlarut = 9,4 × 10^-9 × 25 gr
= 2,35 × 10^-7 gram