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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
Transcribed Image Text:CHEMISTRY 1070 ASSIGNMENT TWO (2)
1. Calculate the mass of 500 atoms of iron (Fe).
2. What number of Fe atoms and what amount (moles) of Fe atoms are in
500.0 g of iron?
3. Diamond is a natural form of pure carbon. What number of atoms of
carbon is in 1.00-carat diamond (1.00 carat = 0.200 g)?
4. Calculate the molar mass of the following substances.
ON
ON
5. Chloral hydrate (C2H3C1302) is a drug formerly used as a sedative and
hypnotic. It is a compound used to make "Mickey Finns" in detective
stories.
a. Calculate the molar mass of chloral hydrate.
b. What amount (moles) of chloral hydrate molecules are in 500.0g
chloral hydrate?
c. What is the mass in grams of 2.0 x 10-2mol chloral hydrate?
d. What number of chlorine atoms is in 5.0g chloral hydrate?
e. What mass of chloral hydrate would contain 1.0g Cl?
f. What is the mass of exactly 500 molecules of chloral hydrate?
6. Calculate the percentage composition by mass of the following
compounds that are important starting materials for synthetic polymers.
a. C,H,0, (acrylic acid from which acrylic plastics are made)
b. C,H,0, (methyl acrylate, from which Plexiglas is made)
c. CH,N (acrylonitrile, from which Orlon is made)
7. Express the composition of each of the following compounds as the mass
percentage of its elements.
a. Formaldehyde, CH20
b. Glucose, C,H120,
c. Acetic acid, HC,H,0,
8. Determine the molecular formulas to which the following empirical
formulas and molar masses pertain.
a. SNH (188.35 g/mol)
b. NPCI, (347.64 g/mol)
c. CoC,0, (341.94 g/mol)
d. SN (184.32 g/mol)
9. A compound that contains only carbon, hydrogen and oxygen is 48.64%
C and 8.16% H by mass. What is the empirical formula for this substance?
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