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Mol Na3PO4 = massa / Mr
mol Na3PO4 = 16.4/(3 * 23 + 31 + 4 * 16)
mol Na3PO4 = 0.1 mol
Mol H2O = koefisien * mol Na3PO4
mol H2O = 12 * 0.1
mol H2O = 1.2 mol
Massa H2O = mol * Mr
massa H2O = 1,2 * (2*1 +16)
massa H2O = 1,2 * 18
massa H2O = 21,6
Massa senyawa adalah :
massa senyawa = massa Na3PO4 + massa H2O
massa senyawa = 16.4 + 21,6
massa senyawa = 38 gram
Jadi, jawabannya adalah B. 38,0 gram.
Semoga membantu :)