# Combustion Etanol

Essay by matamata95High School, 11th gradeB+, October 2011

Investigating Enthalpy Change

by : Arif 11 Sci-2

Aim

To measure the changing energy of alchohol and spiritus into heat energy

Hypothesis

When methanol and ethanol are heated, the ethanol will release more heat than methanol. This hypothesis is based on the currently provided statistics, which state that methanol will release approximately 725 kJ of heat energy per mole and ethanol will release approximately 1,364 kJ of heat energy per mole.

Variables

Independent : Different liquid: Alchohol, and spiritus.

Dependen : The amount of heat released when the liquid is burned, calculated in kJ.

This can be measured using the equation ÃÂH = mcÃÂT. Control : Same initial temperature of water before burn (25 c), same empty weight of

bunsen burner, room temperature, materials, procedure.

Apparatus:

 Name Quantity Beaker Glass 2 Bunsen burner 2 Alchohol 63,46 gr Spiritus 71 gr Water 210 ml( each trial 70 ml) for experiment 1( using alchohol), 210 ml (each trial 70 ml) for experiment 2 (using spiritus) Termometre 2 Holder 2

Procedures:

Put the beaker glass on the holder and put the bunsen burner below the holder.

Fill the empty bunsen burner with alchohol (63,46 gr) then measure the mass of it.

Fill the empty beaker glass with water (70 ml) then measure the mass of it.

Put the termometer into beaker glass that filled with water. Record the temperature of water (25c).

Set the fire on from bunsen burner that filled with alchohol. Let the fire burn the water until the temperature of water become 40 degree celcius).

Off the fire and measure the mass of alchohol with bunsen burner.

Calculate the etanol mass that burned which is: (bunsen burner mass + alchohol mass) before burned - (bunsen burner mass + alchohol mass) after burned.

Calculate how many heat kilojoule...