Page 14 - 1202 Question Bank Chemistry Form 5 KSSM

PAPER 3

1. A student carried out an experiment to determine the heat of combustion of methanol, ethanol, propanol
and butanol. Diagram 1 shows the apparatus set-up for the experiment.
Thermometer

Wind shield

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Copper can Water

Pipeclay triangle

Spirit lamp Fuel
Wooden block
Alcohol
Diagram 1
Table 1.1 shows the mass of lamp before and after burning of the alcohols.

Reading of electronic balance
Alcohol Mass of alcohol used (g)
Before After

Methanol,
CH OH
3
244.95 g 243.40 g

Ethanol,
C H OH
2 5
202.00 g 200.80 g

Propanol,
C H OH
3 7
234.40 g 233.30 g

73
Question 1:
Mass of spirit lamp reduced = Mass of alcohol burnt SOS TIP