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Stoichiometry and Stoichiometric Calculations

A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4. The evolved gaseous  mixture is passed through KOH pellets. Weight (in g) of the remaining product at STP will be



H2O absorbed by H2SO4. Gaseous mixture (containing CO and CO4) when passed through KOH pellets, CO2 gets absorbed.

 Moles of CO left (unabsorbed) =120+120=110

 Mass of CO= moles × molar mass 

                             =110×28=2.8 g

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