How do you calculate the mass of a solution using the energy equation?

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To calculate the mass of a solution, add the masses of the solute and solvent together. In this case, a 10.2 g sample of CaCl2 is dissolved in 103 g of water, resulting in a total mass of 113.2 g for the solution. The final temperature can be calculated using the energy equation Q=cmΔt, where Q is the energy, c is the specific heat capacity, m is the mass, and Δt is the change in temperature. The specific heat capacity is given as 4.18 J/°C·g, and the initial temperature is 25.0°C. The discussion highlights the need to know the energy involved in the reaction to proceed with the calculation.
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How do you find the mass of a solution?
 
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Erm.. would you like to be more specific?
 
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.
 
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.
 
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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