A sample of potassium hydrogen carbonate decomposes to give 255 mL of carbon dioxide at STP according

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A sample of potassium hydrogen carbonate decomposes to give 255 mL of carbon dioxide at STP according to the chemical reaction: 

KHCO3(s) → K2CO3(aq) + H2O(l) + CO2(g) 

Draw a stoichiometry concept map and calculate:

(a) The mass of KHCO3 decomposed

(b) The mass of K2CO3 produced.

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