1. [6]   At elevated temperatures, potassium perchlorate decomposes to produce

              potassium hypochlorite and molecular oxygen gas. A 0.8988 g sample of

              impure potassium perchlorate was heated until the production of molecular

              oxygen gas ceased.  A total 48.8 mL of molecular oxygen gas were collected

              in a buret over water at a temperature of 22.0 oC and a barometric pressure of

             734 mm Hg.

 

a)      Write a balanced equation for the decomposition reaction.

 

 

 

 

 

 

 

 

 

 

 

 

b)      Calculate the mass percent of potassium perchlorate in the original

sample.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. [4]   A compressed gas cylinder contains 1.00 x 103 grams of Ar and

              8.20 x 102 grams of Ne. The pressure inside the cylinder is 148.8 atm.

              The internal volume for the cylinder is 17.8 L.

 

a)      Calculate the partial pressure for the Ar gas in the cylinder.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                b)  What is the temperature of the gaseous mixture in the cylinder?

 

 3.        [12]  Complete the following table:

 

 

Molecular             Lewis Dot          Sketch of the          VSEPR      Molecular       Is the

Species                 Structure            Molecule (with       Notation     Shape             molecule

                                                        lone pairs)                                                         polar?

 

 

 

 

SeF4

 

 

 

 

 

 

 

 

 

 

SbCl5

 

 

 

 

 

 

 

 

 

 

 

 

 

                                                         

PF6-

 

 

 

 

 

 

 

 

 

 

 

 

4.         [6]  a)  Draw three valid resonance structures for fulminic acid. 

                      Be sure to include all non-zero formal charges. Pick the structure(s)

                      that most accurately depict(s) the bonding in the molecule. (Note:

                      The sequence of atoms in the molecule is CNOH).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                 

 

 

 

 

 

 

 

 

 

 

 

 

[6]        13.   The empty molecular orbital diagram for CO is given below. Complete

                     the molecular orbital diagram and then answer the questions posed below.

                     Be sure to identify Atoms A and B and don’t forget to label all of the

                     molecular orbitals in the centre of the diagram.

 

i)        What is the bond order for CO in the ground state?

 

ii)   What is the total number of p-bonds in CO?

 

iii)  Classify  CO as either paramagnetic or diamagnetic. Justify your answer.

 

 

 

 


                            Atom A                                            Atom B