A group measured the mass fraction of calcium carbonate in a limestone. 20g was taken as a nurse sample. 100g of dilute hydrochloric acid with a certain solute mass fraction was added to it

A group measured the mass fraction of calcium carbonate in a limestone. 20g was taken as a nurse sample. 100g of dilute hydrochloric acid with a certain solute mass fraction was added to it

Let the mass fraction of dilute hydrochloric acid be w and the mass fraction of limestone calcium carbonate be a. according to the law of mass conservation, w = 36.5a/1000