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CaCO3
Ca 1*40 = 40
C 1*12 = 12
O 3*16 = 48
____
100
peso molecular del CaCO3 = 100 gr.
6,25 gra CaCO3*(1 mol CaCO3/100 gr. CaCO3) = 0.0625 moles de CaCO3
en notación cientifica 62,5 x 10-³