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    a 25cm3 sample taken from a stock solution of ammonia was mixed with 25 cm3 of a solution containing excess hydrochloric acid the temp rise was 0.7 dc

    1) calculate the number of ammonia moles which have reacted i got
    2.75280899 mol

    2) calculate the concentration of the original stock solution
    this is the 1 i need help on

    i understand i would divide amount of moles by the volume (0.025 dm3) but were do i get the amount of moles from if its the original solution
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    How did you get the first answer? There must be more in the question for that part.
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    if they've given you a dT, have they given you a dH for the reaction as well? That would allow you to work E=mcdT then dH=E/no moles and work out how many moles of ammonia reacted. This would then be divisible by 0.025 to give the concentration.
 
 
 
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