Solve the sums...

Dear student , 
As we know that the sound wave travels more in air so the bottle in which air is more ( Which is being substituted by hydrogen gas ) 
so the bottles in which hydrogen is less will allow the sound wave to travels fast .
In bottle A  :  No of moles of Hydrogen gas = 12 / 2 = 6 moles 
In bottle B ;  No. of mole of Hydrogen gas  =  48 / 2 = 24 moles 
So in bottle A sound will travel fast , and it travels 4 times faster 
Regards
 

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