1 The compound 2-methyl-2-pentene Select one: a. has no structural or geometric
ID: 835402 • Letter: 1
Question
1 The compound 2-methyl-2-pentene Select one:
a. has no structural or geometric isomers
b. has 2 structural alkene isomers, each of which has an E isomer and a Z isomer form.
c. has 5 structural isomers
d. has 3 structural isomers
e. exists as E and Z isomers
2 A mixture consisting of 0.150 M N2(g) and 0.515 M H2(g) reacts and then reaches equilibrium according to the equation:
N2(g) + 3H2(g) ? 2NH3(g)
At equilibrium, the concentration of ammonia is 0.147 M. Calculate the concentration (molarity) of H2(g) at equilibrium to 3 decimal places. Do NOT enter any units.
3
The system H2(g) + X2(g) ? 2HX(g) has a value of 24.4 for the equilibrium constant Kc.
A system being tried in a 3.00 L reactor was charged with 0.150 mol H2, 0.150 mol X2 and 0.600 mol HX.
The catalyst was introduced using a remote unit and the system was allowed to come to equilibrium. Which statement below describes the system coming to equilibrium?
(Note: in the answers, Q refers to the reaction quotient, K refers to the equilibrium constant).
Select one:
a. The reaction goes to the right, as Q < K
b. The reaction goes to the left, as Q < K
c. The reaction goes to the right, as Q > K
d. The reaction goes to the left, as Q > K
e. It is not possible to predict in which direction the system will travel to arrive at equilibrium.
4
Consider the following reaction (assume an ideal gas mixture):
2NOBr(g) ? 2 NO(g) + Br2(g)
A 1.0 L vessel was initially filled with pure NOBr, at a pressure of 4.0 bar, at 300 K. After equilibrium was established the partial pressure of NOBr was 2.5 bar.
p
Explanation / Answer
1. d
Has three structural isomers if you write the structure in newman projection by taking the ethyl groups as a point of view.
2. 0.294
you have to write first the initial (I), change(c), equillibrium(e) table:
N2 3H2 2NH3
I 0.150 0.515 0
c -x -3x 2x
e 0.150-x 0.515-3x 2x=0.147
x= 0.0735
[H2]= 0.515-(3*0.0735)=0.294
3. a
first you need to find the molarity for each species
[H2]= 0.150/3 =0.05
[X2]= 0.150/3= 0.05
[HX]=0.60/3= 0.2
Then find rection quotient Q
Q=[HX]^2/[H2][X2]
Q=(0.2)^2/(0.5*0.5)
Q= 16
since, Q<K reaction will shift to right
4. e
Like in question 2 you have to draw ICE table
2NOBr 2NO Br2
I 4 0 0
c -x 2x x
e 4-x 2x x
The quillibrium conc is found in the following way
4-x=2.5 ===> x=1.5
Kp=(2x)^2*x/(4-x)
=2.16
5. b
Weight of solute /100 g of solvent =wt%
6. e
first you need to find mol fraction of CaCl2
no of mol of water = 100ml =100g/18=5.556
mol fraction of CaCl2= 0.040/(5.556+0.040)=0.007
then use Raoult's law of relative lowering of vapour pressure
(pi-p)/pi=x2
(2.320-p)/2.320=0.007
p= 2.31
7.a
First you need to find molality of ethylene glycol
m= 20*1000/(62.07*85)= 3.791
Then
delTf= Kf Cm
=1.86*3.791
=7.05
Tf= 0-7.05
=-7.06
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.