Homework Answers
moles of HCl = 20 x 1.60 / 1000 = 0.032 mol
moles of NaOH = 60 x 0.40 / 1000 = 0.024 mol
mass of solution = 40 + 20 = 60 g
HCl + NaOH ----------------> NaCl + H2O
1 1 1 1
0.032 0.024
here limiting reagent is NaOH.
Q = n x delta H
= 0.024 x 57.3
Q = 1.375 kJ
Q = m Cp dT
1375 = 80 x 4.184 x (Tf - 20 )
Tf - 20 = 4.108
Tf = 24.1
final temperature = 24.1 oC
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