Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393600681
Author: Gilbert
Publisher: W. W. Norton & Company
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Question
Chapter 2, Problem 2.74QA
Interpretation Introduction
To calculate:
Molar mass of each of the given common sweeteners.
Expert Solution & Answer
Answer to Problem 2.74QA
Solution:
a. Molar mass of C12H22O11 = 342.2948 g/mole - sucrose
b. Molar mass of C7H5O3NS =183.1855 g/mole - saccharin
c. Molar mass of C14H18N2O5 = 294.3052 g/mole - aspartame
d. Molar mass of C6H12O6 = 180.1548 g/mole - fructose
Explanation of Solution
a. The molar mass of C12H22O11 is the sum of the masses of 12 moles of carbon atoms, 22 moles of hydrogen atoms and 11 moles of oxygen atoms.
b. The molar mass of C7H5O3NS is the sum of the masses of 7 moles of carbon atoms, 5 moles of hydrogen atoms, 3 moles of oxygen atoms, 1 mole of nitrogen atoms and 1 mole of sulphur atoms.
c. The molar mass of C14H18N2O5 is the sum of the masses of 14 moles of carbon atoms, 18 moles of hydrogen atoms, 2 moles of nitrogen atoms and 5 moles of oxygen atoms.
d. The molar mass of C6H12O6 is the sum of the masses of 6 moles of carbon atoms, 12 moles of hydrogen atoms and 6 moles of oxygen atoms.
Conclusion:
The molar mass of each of the given common sweeteners is calculated.
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111
States of Matter
Understanding conceptual components of the enthalpy of solution
0/5
Ge
A small amount of acetonitrile (CH, CN) is dissolved in a large amount of water. Imagine separating this process into the four stages sketched below. (These
sketches show only a portion of the substances, so you can see the density and distribution of atoms and molecules in them.)
CH,CN
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B
88
C
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The enthalpy of solution AH is negative
soln
when CH3CN dissolves in water. Use this
information to list the stages in order of increasing
enthalpy.
Would heat be absorbed or released if the system
moved from Stage C to D?
What force would oppose or favor the system
moving from Stage C to D? Check all that apply.
1
absorbed
O released
neither absorbed nor released.
none
O ionic bonding force
covalent bonding force…
In a system with an anodic overpotential, the variation of ŋ as a function of
the current density:
1. at low fields is linear 2. at higher fields, it follows Tafel's law
Find the range of current densities for which the overpotential has the same
value as when calculated for cases 1 and 2 (maximum relative difference of
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range does this correspond?
Data: 10 = 1.5 mA cm², T = 300°C, ẞ = 0.64, R = 8.314 J K 1 mol¹ and F = 96485
C mol-1.
Indicate 10.6 with only one significant figure.
Chapter 2 Solutions
Chemistry: An Atoms-Focused Approach
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