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

[viper2308]

How do you find the mass of a solution?

 

[cristo]

Erm.. would you like to be more specific?

 

[viper2308]

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.

 

[chemisttree]

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.

 

[Remnant]

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"