# Homework Help: Mass of a solution

1. Oct 1, 2007

### viper2308

How do you find the mass of a solution?

2. Oct 1, 2007

### cristo

Staff Emeritus
Erm.. would you like to be more specific?

3. Oct 1, 2007

### 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.

4. Oct 2, 2007

### 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.

5. Oct 4, 2007

### 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"