Unit 2, Homework No. 1: Chemical Equilibria SOLUTIONS
1.
3.
4. Calculate the initial partial pressure of ammonia (assuming it to behave like an ideal
gas).
NH4HS(s)
Initial:
Equilibrium
NH3(g)
2.43 at
Chemistry 1a 2011. Unit 2, Homework No. 1: Gases SOLUTIONS
1.
2.
3.
4.
5. (a) Determine V1 = nRT/P1 and V2 = nRT/P2
Then calculate work done w = -P(V2 V1), in this case P = 5 bar.
(b) Again use w = -P
Unit 1, Homework No. 1: Statistical Treatment of Data - SOLUTIONS
1. The ideal gas law is PV = nRT , or
n=
PV
0.855atm 18.85L
16.11675
=
=
= 0.661
1
1
RT 0.0820578 L.atmK .mol ( 297 K ) 24.3711666
Rel
Chemistry 1a 2011. Unit 2, Homework No. 2: Kinetic Gas
Theory SOLUTIONS
1. Use the root-mean square speed.
urms =
3RT
M
Your answer should be 1.92 103 m/s
Convert to miles per hour. We get 4.29 103 mi
Unit 1, Homework No. 3: Stoichiometry and Types of Reactions
SOLUTIONS
1. (a) The balanced equation is:
mass
55g
=
= 0.318mol
(b) Determine number of moles of Cr2S3 molar mass 173.21g / mol
Number of
Unit 1, Homework No. 2: Electron Configurations, Lewis Structures, and the VSEPR Model
SOLUTIONS
1. Na: 1s22s22p63s1 or [Ne]3s1
Na+: 1s22s22p6 or [Ne]
2. (a) Br: 1s22s22p63s23p64s23d104p5 or [Ar]4s23d
Solutions to Unit 4 Homework Chemistry 1A
1. When brick 1 is brought in contact
with brick 2, heat flows from brick 1
Brick 1
Brick 2
to brick 2, until thermal equilibrium
Brick 1 Brick 2
is reached.