After plotting the ln(K_sp) vs. 1/T (K^-1) data for their potassium nitrate (KNO

Question

After plotting the ln(K_sp) vs. 1/T (K^-1) data for their potassium nitrate (KNO_3) saturated solution experiment, a group of students obtained a plot with an equation of the line of y = -3, 743x + 15.28 for the dissolution of KNO_3. Based on the above results, what is the Enthalpy of Solution (Delta H_soln) of KNO_3 salt in water, in J/mol? -3.743 15.28 127.0 31.120 -450.2 Based on the above results, what is the Entropy of Solution (Delta S_soln) of KNO_3 salt in water, in J/K? -3.743 15.28 127.0 31.120 -450.2

Explanation / Answer

Q6.

find HSoln for this value

note that

ln(K) = -dH/R*(1/T1) + dS/R is true

so

slope = -dH/R

slope = -3743

dH/8.314 = 3743

dH = 8.314*3743 = 31119.302

best answer is D 31119.302 J/mol

Q2.

find Entropy

dS/R = y-intercept

y-intercept = 15.28

S = R*15.28

S = 8.314*15.28 = 127

choose C

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