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caco3 :
ca: 1x 20:20
c: 1x 6: 6
o: 3x 16:48
total : 47uma
C: 12 g.
O: 16 x 3 = 48 g.
40 + 12 + 48 = 100 g.
el peso molecular del carbonato de calcio: CO3Ca es 100g.