Given the reaction : 

C_{2}H_{5}OH\; +\; 3O_{2} \rightarrow\; 2CO_{2}\; +\; 3H_{2}O

How many grams of H2O is produced when 92g of C2H5OH is burnt?

Answers (1)

Ethanol belongs to alcohol and when it is burnt, ethanol releases CO2 gas and H2O gas. The reaction takes place in presence of molecular O2 as follows:

C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O

23 g of ethanol = 23 g/molecular mass of ethanol

= 23/46 mole ethanol or 0.5 mole.

On the basis of the above reaction, 1 mole of ethanol generates 2 moles of CO2 or 2 x molecular mass of CO2 = 2 moles x 44 g/mole = 88 g of CO2..

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