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A is a solution containing 6.39g/dm3 of HCl. B is a solution of hydrated trioxocarbonate...

A is a solution containing 6.39g/dm3 of HCl. B is a solution of hydrated trioxocarbonate (IV) salt (Na2Co3.XH2O) containing 11g/dm3 of trioxocarbonate IV (Take avarage titre=20.80). From the information, calculate:
(a) concentration in mol/dm3
(b) concentration in g/dm3
(c) value of X in g/dm3 of B. Please help solve this question?

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