You are trying to find the heat (qrxn) in joules.
C is 4.19
Change in temp is -2.2
I don't know how to find the mass if they tell me that the density of the solution is 1.02 and that the volume of water is 100 mL
(Should I use the mass of the solution I calculated which was 5.5 because why would they give me density in the question I don't need it
To find the heat (qrxn) in joules, you need to use the equation:
qrxn = C * m * ΔT
where:
- qrxn is the heat absorbed or released by the reaction in joules,
- C is the specific heat capacity of the substance (given as 4.19 J/g°C),
- m is the mass of the substance in grams,
- ΔT is the change in temperature in degrees Celsius.
In this case, you have been given the specific heat capacity (C) and the change in temperature (ΔT). The missing piece of information is the mass (m) of the substance.
To find the mass, you can use the density (d) and volume (V) relationship given as:
d = m/V
where:
- d is the density,
- m is the mass,
- V is the volume of the substance.
You mentioned that the density of the solution is 1.02. However, you have also mentioned the volume of water as 100 mL. To calculate the mass of the substance, you need to know the total volume of the solution (water + solute). If you only have the volume of water, you won't be able to determine the mass accurately.
If you have the volume of the entire solution, you can use the density formula to find the mass:
m = d * V
Once you have the mass, you can substitute it into the heat equation to calculate qrxn. Remember to convert the mass of the substance to grams if it's given in a different unit.
Hope this helps! Let me know if you have any further questions.