Jika Ar H=1, C=12, N=14, O=16, Na=23, Mg=24, P=31, S=32,

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Jika Ar H=1, C=12, N=14, O=16, Na=23, Mg=24, P=31, S=32, Cl=35,5, Ca=40, Fe=56, Cu=63,5, dan Sr=88; tentukan massa molekul relatif (Mr) senyawa berikut.a. Na2 CO3 b. Mg(OH)2 c. Sr3(PO4)2
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