Small amounts of oxygen gas can be prepared in the laboratory by decomposing potassium chlorate with heat. A by-product of the decomposition is potassium chloride. When one mole of potassium chlorate decomposes, 44.7 kJ are evolved. (a) Write a balanced thermochemical equation for the decomposition of one mole of potassium chlorate. (b) Is the reaction exothermic? (c) Draw an energy diagram showing the path of this reaction. (Figure 8.6 is an example of such an energy diagram.) (d) What is Δ H when 3.00 g of potassium chlorate decompose? (e) How many grams of potassium chlorate need to be decomposed to liberate fifteen kilojoules of heat?
Small amounts of oxygen gas can be prepared in the laboratory by decomposing potassium chlorate with heat. A by-product of the decomposition is potassium chloride. When one mole of potassium chlorate decomposes, 44.7 kJ are evolved. (a) Write a balanced thermochemical equation for the decomposition of one mole of potassium chlorate. (b) Is the reaction exothermic? (c) Draw an energy diagram showing the path of this reaction. (Figure 8.6 is an example of such an energy diagram.) (d) What is Δ H when 3.00 g of potassium chlorate decompose? (e) How many grams of potassium chlorate need to be decomposed to liberate fifteen kilojoules of heat?
Solution Summary: The author explains that a thermochemical equation for the decomposition of potassium chlorate (KClO3) should be presented.
Small amounts of oxygen gas can be prepared in the laboratory by decomposing potassium chlorate with heat. A by-product of the decomposition is potassium chloride. When one mole of potassium chlorate decomposes, 44.7 kJ are evolved.
(a) Write a balanced thermochemical equation for the decomposition of one mole of potassium chlorate.
(b) Is the reaction exothermic?
(c) Draw an energy diagram showing the path of this reaction. (Figure 8.6 is an example of such an energy diagram.)
(d) What is ΔH when 3.00 g of potassium chlorate decompose?
(e) How many grams of potassium chlorate need to be decomposed to liberate fifteen kilojoules of heat?
Please draw the inverted chair forms of the products for the two equilibrium reactions
shown below. Circle the equilibrium reaction that would have a AG = 0, i.e., the relative energy of
the reactant (to the left of the equilibrium arrows) equals the relative energy of the product? [No
requirement to show or do calculations.]
CH3
CH3
HH
CH3
1
-CH3
5.
Please consider the Newman projection of tartaric acid drawn below as an eclipsed
conformer (1). Please draw the most stable conformer and two intermediate energy conformers
noting that staggered conformers are lower in energy than eclipsed forms even if the staggered
conformers have gauche relationships between groups. [Draw the substituents H and OH on the front
carbons and H, OH and CO₂H on the back carbons based on staggered forms. -CO₂H is larger than -OH.]
OH
COH
ICOOH
COOH
COOH
1
2
COOH
COOH
3
4
Staggered
Staggered
Staggered (most stable)
Indicate the number of each conformer above (1, 2, 3 and 4) that corresponds to the relative energies
below.
Ref=0
Rotation
6. (60 points)
a. Are compounds 1 and 2 below enantiomers, diastereomers or identical?
OH
OH
HO
HO
LOH
HO
HO
OH
2
OH
OH
b. Please complete the zig-zag conformation of the compound
(3R,4S)-3,4-dichloro-2,5-dimethylhexane by writing the respective atoms in the boxes.
3.
The plutonium isotope with 144 neutrons
Enter the chemical symbol of the isotope.
Chapter 8 Solutions
Student Solutions Manual For Masterton/hurley's Chemistry: Principles And Reactions, 8th
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