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Mg = 1 x 24 = 24
N = 1 x 14 = 14
O = 6 X 16 = 96
24+14+96 = 134
b. Besi (III) Fosfat (FePO4)
Fe = 1 x 56 = 56
P = 1 x 31 = 31
O = 4 x 16 = 64
56+31+64 = 151
c. Natrium sulfida (Na2S)
Na = 2 x 23 = 46
S = 1 x 32 = 32
46+32 = 78
d. Kalsium nitrida (Ca3N2)
Ca = 3 x 40 = 120
N = 2 x 14 = 28
120+28 = 148
e. Besi (III) klorida (FeCl3)
Fe = 1 x 56 = 56
Cl = 3 x 35 = 105
56+105 = 161
f. Nitrogen dioksida (NO2)
N = 1 x 14 = 14
O = 2 x 16 = 32
14+32 = 46
g. Nitrogen trioksida (NO3)
N = 1 x 14 = 14
O = 3 x 16 = 48
14+48 = 62
h. Karbon tetraklorida (CCl4)
C = 1 x 12 = 12
Cl = 4 x 35 = 140
12+140 = 152
i. Asam Nitrat (HNO3)
H = 1 x 1 = 1
N = 1 x 14 = 14
O = 3 x 16 = 48
1+14+48 = 63
j. Kalsium karbonat (CaCO3)]
Ca = 1 x 40 = 40
C = 1 x 12 = 12
O = 3 x 16 = 48
40+12+48 = 100
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