Question

Use the following:

_KHCO3 (s) -> _K2CO3 (s) + _H2CO3 (g)

A  2.154g unknown sample containing potassium hydrogen carbonate is decomposed with heat. If the mass lost 0.426g of H2CO3, what is the percentage of KHCO3 in the unknown mixture?

(a) Mass of KHCO3 in mixture

(b) Percentage of KHCO3 in mixture

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