Question

1. A volume of water was heated to 81.76 °C and immediately added to 48.80 mL of water at 20.55 °C contained within a coffee cup calorimeter. The final temperature of the mixture was 37.73 °C. The final volume of water inside the calorimeter was 92.03 mL. Assuming that them heat capacity of the solution is 4.18 J/g/°C, calculate the following:

a. The volume of hot water added
ml

b. The mass of hot water (d_water = 1.00 g/mL)
g

c. The mass of the cold water (d_water = 1.00 g/mL)
g

d. The change in temperature (∆T) of hot water
°C

e. The change in temperature (∆T) of cold water
°C

f. The calorimeter constant in J/°C (C_p(water) = 4.18 J/g/°C)
J/°C

2. A 49.21 mL volume of 1.00 M HCl was mixed with 48.05 mL of 2.00 M NaOH in a coffee cup calorimeter (with calorimeter constant = 25.6 J/°C) at 20.32 °C. The final temperature of the aqueous solution after the reaction was 29.83 °C. Assuming that them heat capacity of the solution is 4.18 J/g/°C, calculate the following:

a. The total mass of aqueous solution inside the calorimeter (d_soln = 1.00 g/mL)
g

b. The change in temperature (∆T) of the aqueous solution
°C

c. The heat released by the neutralization reaction (this should be a positive number)
J

d. The moles of HCl reacted
mol

e. The enthalpy change (∆H) for the neutralization in kJ/mol HCl ( this should be a negative number)
kJ/mol HCl

Answer 1

final veume 0ater votume of td water =92.03 ml 48.80 mL vume of hot water aaied 92-03-48-30 mL 43. 23 mL Au b. density ot oate 1J/mL mass fhot aten 43-23 x 1 43. 2 3 Au mass fthe efd water 48 80 m x 1 9/mt 11 48. 80 9 The change in tenperture hot water

4T 31.73 - 2|76) c - 44 03 C Au The change in +emperatwre t utd water 37 73-20-55c ATcold 17 18 C Aus heat the hot water ost 43.23 x 4.18 J. g - at X44.03 7956 J fu significant tigwres 1

heat gained by the cdd oater 48-80 gx 4-18 J X 13 18 Jfour signitieant = 3504 Let heat alosonbea by the alori meter Be a utd t + 1 -7956 + 350 4) J 445 2 J

The calonime ten comtant 4 45 2 J 17 18 three Cant figures ATcdd °c signif 259 J/c Aus
For the other answer please post it as another question......