Mass of calcium trioxocarbonate (4) used in caco3+2hcl=cacl2+co2+h2o when 0.1 mole of hydrochloric acid react with calcium trioxocarbonate (4)

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There is no such name as calcium trioxocarbonate (4). I know you mean CaCO3. An accepatble IUPAC is calcium carbonate. Where did you get that name? From a teacher? from book? from an article? Please tell me where you came up with that name and I'll respond with how to work the problem.

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