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Chm 171

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Chm 171
UNIVERSITY OF PRETORIA UNIVERSITEIT VAN PRETORIA ` DEPARTEMENT OF CHEMISTRY DEPARTMENT CHEMIE DATE / DATUM: TIME / TYD: MARKS / PUNTE: 2008.05.30 120 min 80

Outeursreg voorbehou

Fakulteit Natuur- en Landbouwetenskappe CHM 171 EXAMINATION / EKSAMEN

Internal Examiners / Interne Eksaminatore: External Examiner / Eksterne Eksaminator: Surname and Initials Van en Voorletters Signature Handtekening

Dr FR Vogel Dr RJ Bowen Dr EMM Venter Prof WJ Schoeman

Student number Studentenommer

Marks / Punte Question 1 / Vraag 1 Section A Afdeling A Question 2 / Vraag 2 Question 3 / Vraag 3 Question 4 / Vraag 4 Question 5 / Vraag 5 Questtion 6 / Vraag 6 Section B Afdeling B Total / Totaal Section A / Afdeling A: Instructions / Instruksies 5 5 7 6 13 9 38 80(+3 bonus)

Examiner / Eksaminator

1. Answer all questions in ink. Answers in pencil will not be marked. Beantwoord alle vrae in ink. Antwoorde in potlood sal nie nagesien word nie. 2. Silent calculators may be used. Geluidlose sakrekenaars mag gebruik word. 3. Do not use Tipp-Ex or any similar liquid paper product on your paper. Answers that should not be marked must be clearly indicated. Geen Tipp-Ex of soortgelyke vloeibare papiermiddels mag op die antwoordstel gebruik word nie. Antwoorde wat nie nagesien moet word nie, moet duidelik doodgetrek word. 4. All cellphones must be switched off. Alle selfone moet afgeskakel wees.

1

Section A / Afdeling A: Show all calculations / Toon alle berekeninge Question 1/ Vraag 1 [5]

Fluorocarbonyl hypofluorite has the composition 14.6% C, 39.0% O, and 46.3% F. If the molar mass of the compound is 82 g/mol, determine the molecular formula of the compound. Fluoorkarbonielhipofluoriet bestaan uit 14.6% C, 39.0% O, en 46.3% F. Indien die molekulêre massa van die verbinding 82 g/mol is, bepaal die molekulêre formule van die verbinding.

Question 2/ Vraag 2

[5]

Silver nitrate is added to a 25 cm3 sample of hydrochloric acid. A white precipitate of silver

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