Stoichiometry and Stoichiometric Calculations

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By Expert Faculty of Sri Chaitanya
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Question

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

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Solution

 

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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