(2) Compare the molar enthalpies of neutralization of hydrochloric acid, sulfuri
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Question
(2) Compare the molar enthalpies of neutralization of hydrochloric acid, sulfuric acid, and phosphoric acid. Discuss the similarities and differences of these data. I ust d the stfuic od When a neutralization reaction was carried out using 100.0 mL of 0.7890M NHj water and 100.0 mL of 0.7940M acetic acid, AT was found to be 4.76 °C. The specific heat of the reaction mixture was 4.104 8 K-1 and its density was 1.03 g mL.-1. The calorimeter constant was 3.36 J K (1) Calculate Hneutzn for the reaction of NH3 and acetic acid. + 0oHNH4,100 729.ist loo+ loo) x 1.03 2069 answer (3.36x ·211 neriment, it was discovered that the thermometer had not been rad .50 C low.WhateExplanation / Answer
3)
mass of solution = (100 + 100 ) x 1.03 = 206 g
temperature change = 4.70
specific heat = 4.104 J / g oC
Q = m Cp dT + Cp dT
= 206 x 4.104 x 4.70 + 3.36 x 4.70
Q = 3989.3 J
moles of NH3 = 100 x 0.7890 / 1000 = 0.0789
moles of CH3COOH = 100 x 0.7940 / 1000 = 0.0794
here limting reagent is NH3.
delta H = - Q / n = - 3989.3 x 10^-3 / 0.0789
= - 50.56 kJ /mol
heat of neutralization = - 50.56 kJ/mol
4)
if delta T = 4.76
Q = 4040.211 J
delta H = - 51.207 kJ/mol
% error = theoretical - actual / theoretical ) x 100
= - 51.207 + 50.56 / 51.207 ) x 100
= 1.26 %
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