Chemistry
3rd Edition
ISBN: 9780073402734
Author: Julia Burdge
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 5.7, Problem 1PPA
Interpretation Introduction
Interpretation:
The enthalpy change of the reaction is to be calculated.
Concept introduction:
Hess’s law states that the change in enthalpy of a reaction remains the same whether the reaction takes place in a single step or in a number of steps.
On adding the thermochemical equations, the value of enthalpy change is also added, which gives the enthalpy change of the net reaction.
On reversing any equation, the sign of enthalpy change value is changed to the opposite sign.
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I Review I Constants I Periodic Table
Standard Enthalpy of Formation at 289 K
Substance
Formula AH; (kJ/mol)
Part A
Hydrogen
bromide
HBr(g) -36.26
Hypochlorous acid (HOCI) can decompose in the gas phase according
to the following balanced equation:
Hydrogen
chloride
HCI(g)
-92.30
2 HOCI(g) → 2 HCI(g) + O2(g)
AH = -31.0 kJ (T = 298 K, P = 1
atm)
Hydrogen fluoride HF(g)
-268.60
Using the enthalpy of this reaction and data in the following table,
calculate the standard enthalpy of formation for HOCI(g).
Hydrogen iodide
HI(g)
25.9
Methane
CH4(g)
-74.80
O -123 kJ/mol
+61.3 kJ/mol
Water vapor
H20(g)
-241.8
O -76.8 kJ/mol
-154 kJ/mol
+76.8 kJ/m
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Chapter 5 Solutions
Chemistry
Ch. 5.1 - Practice Problem ATTEMPT
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