# chemistry

posted by .

1. a) 50ml of water at 46.9°C were mixed with 50ml of water at 25.1°C in a calorimeter also at 25.1°C. The final temperature was 30.1°C. Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate the total heat capacity of the calorimeter. (density of water = 1.00g/ml, specific heat capacity = 4.18 j/gk

b) when 5.00g of NaOH (s) are added to 100g of water (using the same calorimeter as in part a), the temperature rises from 25.0°C to 37.5°C. calculate the molar heat of solution, i.e. delta H for the process. assume that the specific heat of water is 4.18 j/gk and that of the NaOH (aq) solution is the same.

• chemistry -

a.
[mass warm H2O x specific heat H2O x (Tfinal-Tinitial)] + [mass cool H2O x specific heat H2O x (Tfinal-Tinitial)] ]+ [Ccal x (Tfinal-Tinitial)] = 0
Solve for Ccal.

b.
[mass H2O x specific heat H2O x (Tfinal-Tinitial)] + [Ccal x (Tfinal-Tintial)] = q = dHsoln in joules.
Convert 5.00 g NaOH to mols. mols = grams/molar mass.

Then dHsoln = q/mol NaOH = ?J/mol. These are most often quoted in kJ/mol and you can make that conversion; divide J/mol by 1000 for kJ/mol

## Similar Questions

1. ### Chem

1) A 15.0 g sample of nickel metal is heated to 100.0 C and dropped into 55.0 g of water, initially at 23.0 C. Calculate the final temperature of the nickel and the water, if the specific heat capacity of nickel is 0.444 j / g x C. …
2. ### chemistry

calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50ml of water from room temperature 20C to 45C?
3. ### Chemistry

Calculate the theoretical amount of CaCl2 that would be required to change the temperature of 50ml of water from room temperature 20C to 45C?
4. ### chemistry

50ml of water at 46.9 C were mixed with 50ml of water at 25.1 C in a calorimeter also at 25.1 C. The final temperature was 30.1 C Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate …
5. ### Chemistry I

In determining the heat capacity of a calorimeter, 50ml of water at 56*C is added to 50ml of water at 23*C. After about five minutes of mixing, the final temperature of the solution inside the calorimeter reached 37*C. Calculate the …
6. ### Chemistry

Help with lab report Need Help finishing my lab report.KNOWN VALUES ARE V OF HCL=50ML,M=2.188.V OF NAOH=55.3ML,M=2.088.INTIAL TEMP FOR HCL=22.5C,NAOH IS 23C.this is for part A: Mass of final NACL solution assuming that the density …
7. ### chemistry

50ml of water at 49.6 C were mixed with 50ml of water at 25.1 C in a calorimeter also at 25.1 C. The final temperature was 30.1 C Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate …
8. ### Chemistry

50mL of water at 46.9 degrees Celsius were mixed with 50mL of water at 25.2 degrees Celsius in a calorimeter also at 25.1 degrees Celsius. the final temp was 30.1 Celsius. assuming that neither the desity of water nor its specific …
9. ### Chemistry

A piece of copper metal is initially at 100.0°C. It is dropped into a coffee cup calorimeter containing 50.0 g of water at a temperature of 20.0°C. After stirring, the final temperature of both copper and water is 25.0°C. Assuming …
10. ### chemistry

50 mL of water at 48.9EC were mixed with 50 mL of water at 23.8EC in a calorimeter also at 23.8EC. The final temperature was 33.1EC. Assuming that neither the density of water nor its specific heat capacity change with temperature, …

More Similar Questions