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Question

Is this balanced correctly?

2Al+6HCl=2Al​​​​​Cl3+3H2


Solution

Solution - 
                The correct equation for the reaction is:

                     2Al + 6HCl = 2AlCl3 + 3H2        

                                      OR

                     2Al + 6H(+) = 2Al(3+) + 3H2      (Ionic equation)

In this reaction, 6 MOLES of HCl are consumed to produce every 3 MOLES of H2.

At STP, 3 moles of H2 gas occupy a volume of 3 x 22.4 litres (that is 67.2 litres). 

Thus, 6 moles of HCl gives 67.2 litres of H2 at STP, not just 3 litres.

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