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Homework Help: Enthalpy change of reaction

  1. Jan 8, 2012 #1
    1. The problem statement, all variables and given/known data
    say we were hydrating Cobalt chloride crystals

    why would
    (i) more cobalt chloride
    (iii) less water
    result in a GREATER temperature change of reaction>

    2. Relevant equations

    3. The attempt at a solution
    for ii I have used Q = mcΔt and on re-arranging to for Δt Q/mc is GREATER for a smaller mass of water.

    for i I am less sure. I thought as follows: heat change is per mole of substance. If we have more moles the heat change will be greater.
    I am not so sure on this though - please could someone confirm if I am correct for both i and ii
  2. jcsd
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