1.

Acetylene burns in oxygen producing carbon dioxide and water. Write the balanced equation for this reaction.

Answer»

Solution : `{:("The reaction is :","Acetylen + Oxgyen"rarr."Carbon dioxide + Water"),("The SKELETON equation is :",C_(2)H_(2)+O_(2)rarrCO_(2)+H_(2)O):}`
To start with, the elementary GAS (oxygen) appearing the above equation is written in the ATOMIC form. We have
`C_(2)H_(2)+OrarrCO_(2)+H_(2)O`
Here, the order of selection of atoms for balancing is C, H, O.
(i) To equalise the number of carbon atoms, multiply `CO_(2)` by 2. We have
`C_(2)H_(2)+Orarr2CO_(2)+H_(2)O`
(ii) The number of H atoms is same on both sides but there are 5 atoms of oxygen on the R.H.S. as against 1 on L.H.S. Hence, multiply the atom O by 5 on L.H.S. We have
`C_(2)H_(2)+5(O)rarr 2CO_(2)+H_(2)O`
It is a balanced atomic equation.
(iii) Multiply the whole EQUAITON by 2 convert it into the molecular equation.
`2C_(2)H_(5)+5O_(2)rarr 4CO_(2)+2H_(2)O`
This is the required balanced molecular equation.


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