Target Equation: (1) Mg(s) + 1/2 O2 (g) → MgO(s) Reactions: (2) MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l) ΔH2 = ? (3) Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g) ΔH3 = ? (4) H2 (g) + 1/2 O2 (g) → H2O (l) ΔH4 = -285.8 kJ Reaction Mass (grams) of MgO(s) Mass (grams) of Mg(s) Volume (mL) of HCl(aq) Concentration of HCl (mol/L) Initial Temp (°C) Final Temp (°C) 2 0.40 n/a 50.0 1.00 21.5 26.5 3 n/a 0.25 50.0 1.00 22.5 34.0 Using the data above, determine the enthalphy change (ΔH) for reactions (2) and (3). List any assumptions you make. Reaction (2): MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l) Reaction (3): Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g)
Target Equation: (1) Mg(s) + 1/2 O2 (g) → MgO(s) Reactions: (2) MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l) ΔH2 = ? (3) Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g) ΔH3 = ? (4) H2 (g) + 1/2 O2 (g) → H2O (l) ΔH4 = -285.8 kJ Reaction Mass (grams) of MgO(s) Mass (grams) of Mg(s) Volume (mL) of HCl(aq) Concentration of HCl (mol/L) Initial Temp (°C) Final Temp (°C) 2 0.40 n/a 50.0 1.00 21.5 26.5 3 n/a 0.25 50.0 1.00 22.5 34.0 Using the data above, determine the enthalphy change (ΔH) for reactions (2) and (3). List any assumptions you make. Reaction (2): MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l) Reaction (3): Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g)
Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter5: Principles Of Chemical Reactivity: Energy And Chemical Reactions
Section: Chapter Questions
Problem 95IL: Insoluble AgCl(s) precipitates when solutions of AgNO3(aq) and NaCl(aq) are mixed. AgNO3(aq) +...
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Target Equation:
(1) Mg(s) + 1/2 O2 (g) → MgO(s)
Reactions:
(2) MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l) ΔH2 = ?
(3) Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g) ΔH3 = ?
(4) H2 (g) + 1/2 O2 (g) → H2O (l) ΔH4 = -285.8 kJ
| Reaction | Mass (grams) of MgO(s) | Mass (grams) of Mg(s) | Volume (mL) of HCl(aq) | Concentration of HCl (mol/L) | Initial Temp (°C) | Final Temp (°C) |
| 2 | 0.40 | n/a | 50.0 | 1.00 | 21.5 | 26.5 |
| 3 | n/a | 0.25 | 50.0 | 1.00 | 22.5 | 34.0 |
Using the data above, determine the enthalphy change (ΔH) for reactions (2) and (3). List any assumptions you make.
Reaction (2): MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l)
Reaction (3): Mg (s) + 2 HCl (aq) → MgCl2 (aq) + H2 (g)
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