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    When we are writing chemical equations for Chemistry A level..are we allowed to put H2..with 2 as a little number because we are making the equation??
    Or are we only allowed to put the number in front??
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    (Original post by Mayflower320)
    When we are writing chemical equations for Chemistry A level..are we allowed to put H2..with 2 as a little number because we are making the equation??
    Or are we only allowed to put the number in front??
    That completely depends upon the reaction, if it involves molecular hydrogen then write molecular hydrogen, if not, then don't.

    If you are simply balancing an equation then obviously you can only do this by changing the stoichiometric coefficients, you can change the subscripts, because that would change the chemical species involved.
 
 
 
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