5. Calculate the percent error between the value of AH for reaction 2 and the sum of AH for reaction 1 plus AH for reaction 3. (Assume AH for reaction 2 to be the accepted value). Show your work. Account for any similarity or difference.
5. Calculate the percent error between the value of AH for reaction 2 and the sum of AH for reaction 1 plus AH for reaction 3. (Assume AH for reaction 2 to be the accepted value). Show your work. Account for any similarity or difference.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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![2. Write net ionic equations for Reactions 1, 2 and 3. Consider the heat given
off in your reactions; include the heat evolved in kJ/mole for each reaction.
Reaction1: Heat of NaOH solution (solid NaOH + H2O)
NaOH(s) > Na(ag) + OH (aa)
Molar mass of NaOH: 39.998 g/mol
mass NaOH
п (Na0H) 3D
M NaOH
1.0 g
п (NaOH)
= 0.025 mol
39.998 g/mol
1.129 kJ
ΔΗ -
-= - 45.16 kJ /mol
0.025 mol
Reaction 2: Heat of NaOH solution (solid NaOH + HCI solution)
NaOH(s) + HCl(ag) → H2Oa) + NaClao)
mass NaOH
п (NaOH) %3D
M NaOH
1.0 g
п (Na0H)
= 0.025 mol
39.998 g/mol
- 2.5 k)
ΔΗ
100.0 kJ/mol
25:
Reaction 3: Heat of Neutralization (NaOH solution + HCI solution)
NaOH(ag) + HCl(ag) → H200 + NaCl(ag)
mass NaOH
п (NaOH) 3D
M NaOH
1.0 g
п (Na0H) %3
= 0.025 mol
39.998 g/mol
-1.400 kJ
ΔΗ-
-56 kJ /mol
0.025 mol
pg. 7
3. The energy in Reaction 1 represents the energy of solution for one mole of
NaOH (s). Look at the net ionic equations for Reactions 2 and 3, and make a
similar statement concerning the significance of AH for reactions 2 and 3.
Enthalpy change of reaction 2 represents the heat evolved as the hydrogen ion
displaces the sodium ion, creating a single displacement reaction. Enthalpy change of
reaction 3 represents the heat evolved as the hydrogen and hydroxide ion form water via
a neutralization reaction.
4. Apply Hess's Law using the sum of reaction 1 and reaction 3 to find the
experimental value of AH for reactions 2. Show your work below.
NaOH(s) → AlaaetOHfe9)
NaOH(s) + HCl(aa) → H2Om + NaCl(a)
AlaOHag) + HCl(ag) → H200 + NaCl(ag)
AH = -1.129 kJ
AH = -2.5 k]
AH = -1.400 kJ
AH = -1.129 kJ + (-1.400 kJ) = -2.5 kJ
5. Calculate the percent error between the value of AH for reaction 2 and the sum of
AH for reaction 1 plus AH for reaction 3. (Assume AH for reaction 2 to be the
accepted value). Show your work. Account for any similarity or difference.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1de68c6e-f567-4b40-b70c-34213ed13dd5%2F0055e3fc-c97e-41cb-bed2-4fa809c53008%2Fzlutdbc_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2. Write net ionic equations for Reactions 1, 2 and 3. Consider the heat given
off in your reactions; include the heat evolved in kJ/mole for each reaction.
Reaction1: Heat of NaOH solution (solid NaOH + H2O)
NaOH(s) > Na(ag) + OH (aa)
Molar mass of NaOH: 39.998 g/mol
mass NaOH
п (Na0H) 3D
M NaOH
1.0 g
п (NaOH)
= 0.025 mol
39.998 g/mol
1.129 kJ
ΔΗ -
-= - 45.16 kJ /mol
0.025 mol
Reaction 2: Heat of NaOH solution (solid NaOH + HCI solution)
NaOH(s) + HCl(ag) → H2Oa) + NaClao)
mass NaOH
п (NaOH) %3D
M NaOH
1.0 g
п (Na0H)
= 0.025 mol
39.998 g/mol
- 2.5 k)
ΔΗ
100.0 kJ/mol
25:
Reaction 3: Heat of Neutralization (NaOH solution + HCI solution)
NaOH(ag) + HCl(ag) → H200 + NaCl(ag)
mass NaOH
п (NaOH) 3D
M NaOH
1.0 g
п (Na0H) %3
= 0.025 mol
39.998 g/mol
-1.400 kJ
ΔΗ-
-56 kJ /mol
0.025 mol
pg. 7
3. The energy in Reaction 1 represents the energy of solution for one mole of
NaOH (s). Look at the net ionic equations for Reactions 2 and 3, and make a
similar statement concerning the significance of AH for reactions 2 and 3.
Enthalpy change of reaction 2 represents the heat evolved as the hydrogen ion
displaces the sodium ion, creating a single displacement reaction. Enthalpy change of
reaction 3 represents the heat evolved as the hydrogen and hydroxide ion form water via
a neutralization reaction.
4. Apply Hess's Law using the sum of reaction 1 and reaction 3 to find the
experimental value of AH for reactions 2. Show your work below.
NaOH(s) → AlaaetOHfe9)
NaOH(s) + HCl(aa) → H2Om + NaCl(a)
AlaOHag) + HCl(ag) → H200 + NaCl(ag)
AH = -1.129 kJ
AH = -2.5 k]
AH = -1.400 kJ
AH = -1.129 kJ + (-1.400 kJ) = -2.5 kJ
5. Calculate the percent error between the value of AH for reaction 2 and the sum of
AH for reaction 1 plus AH for reaction 3. (Assume AH for reaction 2 to be the
accepted value). Show your work. Account for any similarity or difference.
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