Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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niel C. Harris - Q.. x
100%
Signatu
EXAMPLE
Combustion Analysis Calculations
A compound weighing 5.714 mg produced 14.414 mg of CO, and 2.529 mg of H,O upon
combustion. Find the wt% of C and H in the sample.
Solution One mole of CO, contains 1 mol of carbon. Therefore,
Moles of C in sample
moles of CO, produced
gto,
14.414 X 10-3
4
3.275 X 10
mol
44.009 g/mol CO,
Mass of C in sample
(3.275 X 10 mol C)(12.010 6 g/mol C)
= 3.934 mg
3.934 mg C
wt% C =
x 100 = 68.84%
5.714 mg sample
One mole of H,O contains 2 mol of H. Therefore.
Moles of H in sample 2(moles of H,0 produced)
g HO
18.015 g/mol HO
2.529 x 10
- 2.808 × 10mol
Mass of H in sample = (2.808 × 10 "mol H1.008 g/mol H) = 2.830 x 10
0.283 0 mg H
wt% H =
x 100-495%
5.714 mg sample
TEST YOURSELF A 6.234-mg sample produced 12.123 mg Co, and 2.529 mg of H.O
Find the wt of C and H in the sample ARwer: 5307.4.54"
Transcribed Image Text:Pro DC
niel C. Harris - Q.. x
100%
Signatu
EXAMPLE
Combustion Analysis Calculations
A compound weighing 5.714 mg produced 14.414 mg of CO, and 2.529 mg of H,O upon
combustion. Find the wt% of C and H in the sample.
Solution One mole of CO, contains 1 mol of carbon. Therefore,
Moles of C in sample
moles of CO, produced
gto,
14.414 X 10-3
4
3.275 X 10
mol
44.009 g/mol CO,
Mass of C in sample
(3.275 X 10 mol C)(12.010 6 g/mol C)
= 3.934 mg
3.934 mg C
wt% C =
x 100 = 68.84%
5.714 mg sample
One mole of H,O contains 2 mol of H. Therefore.
Moles of H in sample 2(moles of H,0 produced)
g HO
18.015 g/mol HO
2.529 x 10
- 2.808 × 10mol
Mass of H in sample = (2.808 × 10 "mol H1.008 g/mol H) = 2.830 x 10
0.283 0 mg H
wt% H =
x 100-495%
5.714 mg sample
TEST YOURSELF A 6.234-mg sample produced 12.123 mg Co, and 2.529 mg of H.O
Find the wt of C and H in the sample ARwer: 5307.4.54
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