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 donít 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)ClassifyCO as either paramagnetic or diamagnetic. Justify your answer.

 

 

 


††††††††††††††††††††††† ††† Atom A††††††††††††††††††††††††††††††††††††††††††† Atom B