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

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In summary, the conversation discusses how to find the mass of a solution and the equation needed to calculate the final temperature of a solution after a substance is added. The specific heat capacity and initial temperatures are also mentioned. The individual is seeking help with the problem and provides some calculations and equations.
  • #1
viper2308
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How do you find the mass of a solution?
 
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  • #2
Erm.. would you like to be more specific?
 
  • #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.
 
  • #4
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
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"
 

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

How do I find the mass of an object?

To find the mass of an object, you will need to use a scale or balance. Place the object on the scale and record the measurement in grams or kilograms. This will give you the mass of the object.

Can I use any scale or balance to find the mass?

It is important to use a scale or balance that is appropriate for the size and weight of the object. For smaller objects, a digital scale may be more accurate, while for larger objects, a mechanical balance may be better.

What is the SI unit for mass?

The SI unit for mass is the kilogram (kg). However, for smaller objects, the gram (g) may be used. It is important to always include the unit of measurement when stating the mass of an object.

How do I calculate the mass of a liquid?

To find the mass of a liquid, you will need to use a container with a known mass. First, weigh the empty container and record the measurement. Then, fill the container with the liquid and weigh it again. The difference between the two measurements will give you the mass of the liquid.

Can I use a formula to find the mass of an object?

Yes, you can use the formula: mass = density x volume. However, this formula is only applicable for objects with a uniform density. For objects with varying densities, it is best to use a scale or balance to directly measure the mass.

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