4. In a second experiment, 16.00 g of sodium ace- col- tate trihydrate (GMM = 13

Question

4. In a second experiment, 16.00 g of sodium ace- col- tate trihydrate (GMM = 136.08 g mol-1)was dissolved tate in 100.00 mL of water. The initial temperature was L of 25.00°C, and the final temperature was 20.06 °C. was The heat capacity of the reaction mixture was 4.045J g1 deg1. (1) Calculate T, using Equation 9. dT= 20.02.5:00 °C .94"C answer (2) Calculate the heat transferred, Q, using Equation 5 : 3311.45 answer (3) Calculate the number of moles of sodium acetate trihydrate dissolved, using Equation 6. 136-08 q mol- 117o mol answer xis (4) Ca culate Hdissolution for sodium acetate a trihydrate in kJ mol 1, using Equation 7 19 710.4 52 J/mo answer (5) Calculate hydration for converting sodium ng acetate(s) to sodium acetate trihydrate(aq). 2. HAJ 13008 2.34a answer

Explanation / Answer

Q1

dT is correct

Q2

typically, we do not include the system, which is the mass of salt, but it is ok, since it is only 15% difference

Also, note that Q is negative, since dT is decreasing

Q3

correct

Q4

note that if there is decrease in T, HRXn is positive, correct

Q5

This is simply the reversed of Hdissolution, i.e. hydration

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