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Homework Help: Mass of a solution

  1. Oct 1, 2007 #1
    How do you find the mass of a solution?
  2. jcsd
  3. Oct 1, 2007 #2


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    Erm.. would you like to be more specific?
  4. Oct 1, 2007 #3
    yea i thought there may be an equation, sry.

    A 10.2 g sample of CaCl2 is dissolved in 103 g of water, with both substances at 25.0°C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the solution has a specific heat capacity of 4.18 J/°C·g.

    I rly need help on this whole prob but I know the equation to find the final temp but my mass of soln is way off.
  5. Oct 2, 2007 #4


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    Let's see... if you added two things together what would they weigh. If only you knew the masses of the two things in the first place.... hmmmm.
  6. Oct 4, 2007 #5
    Q=cmΔt Q= Energy C = Constant (specific heat) M = mass
    Δ = change in/ Δt = change in temperature (just verifying)
    Q= (4.18)(10.2 + 103) (Tf - 25°C)
    *i do not know how much energy is involved in the reaction or is how many joules unless we were to set that equation equal to "zero"
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