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% garam = 20%
Mr garam (NaCl) = 58,5
massa air = ?
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(massa garam / massa larutan) x 100% = 20%
(massa garam / 200) x 100% = 20%
massa garam = 40 gram
massa air + massa garam = massa larutan
massa air + 40 gram = 200 gram
massa air = 160 gram