Homework #6, Graded Answers
Chem20, Elementary Chemistry
Chapter Five
5.64.) Determine whether each of the following ionic compounds is Type I or Type II and name
each one appropriately.
a)
b)
c)
d)
FeI3  Ionic Type II; iron(III) iodide
PbCl4  Ionic Type II; lead(IV) chloride
SrI2  Ionic Type I; strontium iodide
BaO  Ionic Type I; barium oxide
5.70) Write a formula for each ionic compound.
a)
b)
c)
d)
e)
f)
copper(I) chlorate  CuClO3
potassium permanganate  KMnO4
lead(II) chromate  PbCrO4
calcium fluoride  CaF2
iron(II) phosphate  Fe3(PO4)2
lithium hydrogen sulfite  LiHSO3
5.71) Name each molecular compound.
a)
b)
c)
d)
e)
SO2  sulfur dioxide
NI3  nitrogen triiodide
BrF5  bromine pentafluoride
NO  nitrogen monoxide
N4Se4  tetranitrogen tetraselenide
5.100) Name each compound and calculate its formula mass
a) Al2(SO4)3
aluminum sulfate
= (2)(26.98 amu) + (3)(32.07 amu) + (12)(16.00 amu) = 342.17  342.17 amu
b) P2O3
diphosphorus trioxide
= (2)(30.97 amu) + (3)(16.00 amu) = 109.94  109.94 amu
c)
HClO(aq)
hypochlorous acid
= (1)(1.008 amu) + (1)(35.45 amu) + (1)(16.00 amu) = 52.458  52.46 amu
d) Cr(C2H3O2)3
chromium(III) acetate = (1)(52.00 amu) + (6)(12.01 amu) + (9)(1.008 amu) +
(6)(16.00 amu) = 229.132 amu  229.13 amu
Chapter Six
6.36) What is the mass of 4.91  1021 platinum atoms?
02 at ms t
m le t
022
02 at ms t
0
m le t
t
1.590  1.59 g Pt