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V = 400 mL x 1000 = 0,4 LITROS
Mm(CaCO3) = 100 g/mol
mol/l = ? (molaridad)
n(moles) = masa / Mm sustituyendo:
n = 30 g / 1oo g/mol = 0,3 mol
Molaridad = mol / volumen (Lt)
M = 0,3 MOL / 0,4 Lt = 0,75 mol/Lt = 0,75M