WORKSHEET#14 (Midterm 3 Review)  

 Name: ____________________________   Date: ___________________  

1. The partial pressures of H 2 and Cl 2 in a 7.00 L container at 275 °C were measured and found  to be 380. torr each. How many grams of HCl will be produced given the reaction below has  a yield of 85.0% and that the reaction temperature was held constant at 275 °C? (Answer:  4.82 g)  

 

H 2 + Cl 2 → HCl         

 

 

   

2. How many grams of NH3 will be produced from a reaction between H2 and NO is the partial  pressures of H2 and NO were 536 torr and 602 torr, respectively, and a temperature of 150.  ℃? Assume the reaction volume is 25.0 L and the reaction yield is 100.0%. (Answer: 3.46 g)  

 

H 2 + NO → NH 3 + H 2 O   

  

  

 

 

Page 1 of 3  

Answer Key

275°C + 273 = 548 K 380 . torn=

0.500atm

760

2

For Hz : PV = n RT For Ck : PV = n RT-

n = PVIRT-

n = PVIRT= ( 0.5 atm ) ( 7.00 L ) / ( 0.0821 ) ( 548k ) = ( 0.5 atm ) ( 7.00 L ) / ( 0.0821 ) ( 548K )

n =

0.0778mot n = 0.0778 mot

0.0778mot Hz x Imm!,Fft =

0.156mol Uzx Imm!,Haft =

0.156mol HCl

No limiting reactant0.156mol HCl x

36.46of = 5.69

g HCl1 mol HCl

( 5.69g

HCl ) ( 0.85 ) = 4.83g

5Hz t 2 NO → 2MHz t 2h20

2¥ )150°C t 273 = 423 IT

For Hz :- 536t = 0.705 atm For NO : bojfgtorr = 0.792 atm

760 -

n = PV / RTn = PVIRT

= ( O . 705 atm ) (25.04/10.0821) ( 423 K ) = ( 0.792 atm ) (25.04/10.0821) ( 423 K )n = 0.508 mot Hz

n = 0.570 mot NO

0.508 mol Hz x 25mm!,Ntf3z=NHO.570 mot NO x 22Mmo!,NNH} = 0.570 mol NHS

limitingreadout

0.203 not NHS x 17.04 g1- not Nitz

= 3.46g NHZ

percent yield: 1.00 × 3.46g NH z

= 3.46of NHS

 

3. (11.2) An atom of chlorine and a Cl- ion are drawn below. Identify each and explain your  choice.  

 

     

4. (11.4) Which one in each pair has the larger radius?   a. Fe 2+ or Fe 3+  

  

b. A potassium atom or potassium ion    

c. A sodium ion or a chloride ion    

d. A strontium atom or an iodine atom    

e. A rubidium ion or a strontium ion     

5. (11.44) Classify each of the following molecules as polar or nonpolar:   a. H 2  

   

b. NI 3     

c. CH 3 OH     

d. CS 2  

Page 2 of 3  

ClCl

-

addingan electron makes the atom larger than it

was originally

Ohas more elections

metal. . .when becoming an ion

,it loses an e

-

K is larger than Kt

becomes like Ar↳ becomes like Ne

•

€keKr↳

becomes like Kr

Sr has a stronger nucleus,

me it pulls e- in strongly , making it smaller

nonpolar polar

polar nonpolar

 

6. Draw Lewis structures for the following, and use VSEPR theory to predict their structure.   a. H 2 O  

       

b. CO 2  

 

 

 

 

 

 

 

c. BF 3  

 

 

 

 

 

 

d. CH 4  

 

 

 

 

 

 

 

e. NH 3  

 

 

 

7. What is the pH of a 2.50 x 10 -4 M H 2 SO 4 solution? Assume H 2 SO 4 is a strong acid.  

Page 3 of 3  

H . :O: OH

①

①H'

O' H

H : :&: Lewis VSEPR

÷ : :c : :&.

o. O.

0=0--0

&: :C : ::O.

Lewis ① ①

USE PR

:

E:

. e . .

I VSEPR

. .

. .

if:B

.

: F : Lewis B -i :

if. .

B. . of :- -

E"

I . .

. . a .

! !if

a o

, ,

I

0

:

?:

H° It

H

I VSEPR

H . . :c . OH H :&.

:H Lewisc

H y j'M It

. H H

It

① VSEPRH

. H N. .

' Lll H

It . .No

. . H It : N:H Laius g D. . ° .

H H

pH - -

logCH 'T

( Ht ] = 2 ( H 2504 ] because Hzsoy has tune protons permolecule .

( Ht ] = 5.00×10-4 M

pH = 3.30