A sample contains a mixture of NaHCO3 and Na2CO3 . HCl is added to 15.0 g of the sample , yielding 11.0 g of Nacl. what percent of the sample is Na2CO3 A sample contains a mixture of NaHCO3 and Na2CO3 . HCl is added to 15.0 g of the sample yielding 11.0 g of [...]