CP Chemistry
Name: ______________________________________ Date: ________________ Mods: ___________
Ch. 7 (Part II) Review
PART A – SHAPES
Complete the Following Table using VSEPR Theory.
Formula
1.
CF4
2.
CO3-2
3.
NH3
4.
ClF3
5.
XeF2
Lewis Dot
Structure
# of
atoms
bonded
to
central
# of
nonbonding
electron
pairs on
central
# of
domains
around
central
ABN
type
Molecular
Geometry
(VSEPR
shape)
Polar or
Nonpolar?
(P or NP)
PART B – MOLAR MASS
***FOR ALL CALCULATIONS, SHOW YOUR WORK AND INCLUDE UNITS***
1. Calculate the molar mass for each of the following compounds. Include units!
Ca(NO3)2
Name:
PbI2
Molar mass:
Name:
Molar mass:
PART C – PERCENT COMPOSITION
2. What is the percent composition of Mg(OH)2?
Name:
Molar Mass:
% Mg _______________ %O________________ %H_______________
PART D – MOLAR CONVERSIONS (Show your work and include units!)
3. How many moles are there in 1.20  1025 molecules of NF3?
Name:
Answer:
4. If 380 g of sucrose (C12H22O11) are required to make 2 quarts of Kool-Aid, how many molecules of
sucrose are used in this recipe?
Formula: C12H22O11
Molar mass:
Answer:
5. If you pump 4088 g of liquid octane (C8H18) into your gas tank, how many moles of octane are you
pumping?
Formula: C8H18
Answer:
Molar mass:
PART E – EMPIRICAL FORMULAS
6. A component of protein called serine has a percent composition of 34.95% Carbon, 6.844%
Hydrogen, 46.56% Oxygen and 13.59% Nitrogen. What is the empirical formula of serine?
Answer:
PART F – WRITING FORMULAS
Write formulas for each of the following:
1. Iron (II) Phophate
_______________________________________
2. Dichlorine Pentoxide
________________________________________
3. Hydrobromic Acid
________________________________________
4. Sulfur Tetranitride
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5. Magnesium Cyanide
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6. Oxalic Acid
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