Answered: Calculate the standard enthalpy of…

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter15: Energy And Chemical Change

Section: Chapter Questions

Problem 112A: sample of natural gas is analyzed and found to be88.4% methane (CH4) and 11.6% ethane (C2H6) bymass....

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Calculate the standard enthalpy of reaction, Δ?∘rxn,, of each of the given acid–base neutralization reactions involving the strong base KOH. The standard enthalpy of formation data are provided.

Compound or Ion	Standard Enthalpy of Formation (kJ/mol)
KOH(aq)	−482.4
H2O(l)	−285.8
HClO3(aq)	−98.4
KClO3(aq)	−349.5
HBr(aq)	−121.0
KBr(aq)	−372.1
NH+4(aq)	−132.5
NH3(aq)	−80.3
K+(aq)	−251.2

HClO3(aq)+KOH(aq)⟶KClO3(aq)+H2O(l)

Δ?∘rxn=_________________kJ/mol

HBr(aq)+KOH(aq)⟶KBr(aq)+H2O(l)

Δ?∘rxn=__________________kJ/mol

NH+4(aq)+KOH(aq)⟶NH3(aq)+K+(aq)+H2O(l)

Δ?∘rxn=_________________kJ/mol

Based on the Δ?∘rxn values, what is the most likely conclusion about the strength of the acids?

1. HClO3(aq) and HBr(aq) are weak acids, and NH+4(aq) is a strong acid.

2. HClO3(aq), HBr(aq), and NH+4(aq) are all strong acids.

3. HClO3(aq), HBr(aq), and NH+4(aq) are all weak acids.

4. HClO3(aq) and HBr(aq) are strong acids, and NH+4(aq) is a weak acid.

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