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

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Discussion Overview

The discussion revolves around calculating the mass of a solution in the context of a thermal energy problem involving the dissolution of calcium chloride in water. Participants explore the necessary equations and concepts related to specific heat capacity and temperature change, while seeking clarification on the mass calculation.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Conceptual clarification

Main Points Raised

  • One participant asks how to find the mass of a solution, indicating a need for clarity on the calculation process.
  • Another participant requests more specificity regarding the question, suggesting that additional details are necessary for a proper response.
  • A participant provides a specific scenario involving 10.2 g of CaCl2 and 103 g of water, expressing confusion about the mass of the solution and the final temperature calculation.
  • One reply suggests a basic approach to finding the total mass by adding the masses of the solute and solvent, though it implies a lack of initial knowledge about these masses.
  • A participant presents the energy equation Q=cmΔt, defining the variables involved, but expresses uncertainty about the energy change in the reaction and how to proceed without that information.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants express varying levels of understanding and uncertainty regarding the mass calculation and the energy involved in the dissolution process.

Contextual Notes

Participants have not resolved the assumptions regarding the energy change in the reaction or the specific heat capacity of the solution, which may affect the calculations.

viper2308
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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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