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WebAssign for Zumdahl/Zumdahl/DeCoste's Chemistry, 10th Edition [Instant Access], Single-Term
10th Edition
ISBN: 9781337909969
Author: Zumdahl; Steven S.
Publisher: Cengage Learning US
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Chapter 2, Problem 40E
A sample of H2SO4 contains 2.02 g of hydrogen, 32.07 g of sulfur, and 64.00 g of oxygen. How many grams of sulfur and grams of oxygen are present in a second sample of H2SO4 containing 7.27 g of hydrogen?
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Using the conditions of spontaneity to deduce the signs of AH and AS
Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy
AS.
Note: if you have not been given enough information to decide a sign, select the "unknown" option.
reaction
observations
conclusions
A
This reaction is always spontaneous, but
proceeds slower at temperatures above
120. °C.
ΔΗ is
(pick one)
AS is
(pick one)
ΔΗ is
(pick one)
B
This reaction is spontaneous except above
117. °C.
AS is
(pick one)
ΔΗ is
(pick one)
This reaction is slower below 20. °C than
C
above.
AS is
|(pick one)
?
18
Ar
1
Calculating the pH at equivalence of a titration
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Your answer is incorrect.
0/5
a
A chemist titrates 70.0 mL of a 0.7089 M hydrocyanic acid (HCN) solution with 0.4574M KOH solution at 25 °C. Calculate the pH at equivalence. The pK of
hydrocyanic acid is 9.21.
Round your answer to 2 decimal places.
Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of KOH solution added.
pH
=
11.43]
G
00.
18
Ar
B•
Biological Macromolecules
Naming and drawing the products of aldose oxidation and reduction
aw a Fischer projection of the molecule that would produce L-ribonic acid if it were subjected to mildly oxidizing reaction conditions.
Click and drag to start drawing a
structure.
X
AP
‡
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Naor
Explanation
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Chapter 2 Solutions
WebAssign for Zumdahl/Zumdahl/DeCoste's Chemistry, 10th Edition [Instant Access], Single-Term
Ch. 2 - Use Daltons atomic theory to account for each of...Ch. 2 - What evidence led to the conclusion that cathode...Ch. 2 - What discoveries were made by J. J. Thomson, Henri...Ch. 2 - Consider Ernest Rutherfords -particle bombardment...Ch. 2 - Do the proton and the neutron have exactly the...Ch. 2 - What is the distinction between atomic number and...Ch. 2 - Distinguish between the terms family and period in...Ch. 2 - The compounds AlCl3, CrCl3, and ICl3 have similar...Ch. 2 - Prob. 9RQCh. 2 - How would you name HBrO4, KIO3, NaBrO2, and HIO?...
Ch. 2 - Which of the following is true about an individual...Ch. 2 - How would you go about finding the number of chalk...Ch. 2 - These questions concern the work of J. J. Thomson....Ch. 2 - Prob. 4ALQCh. 2 - You have a chemical in a sealed glass container...Ch. 2 - The formula of water is If-O. 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R and Q, combine to form two binary...Ch. 2 - In Section 1.1 of the text, the concept of a...Ch. 2 - In a combustion reaction, 46.0 g of ethanol reacts...Ch. 2 - Early tables of atomic weights (masses) were...Ch. 2 - Indium oxide contains 4.784 g of indium for every...Ch. 2 - Prob. 49ECh. 2 - If you wanted to make an accurate scale model of...Ch. 2 - In an experiment it was found that the total...Ch. 2 - A chemist in a galaxy tar, far away performed the...Ch. 2 - What are the symbols of the following nonmetals:...Ch. 2 - Prob. 55ECh. 2 - In the periodic table, how many elements are found...Ch. 2 - a. Classify the following elements as metals or...Ch. 2 - a. List the noble gas elements. 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