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Enthalpy Lab

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Enthalpy Lab
LAB OF ENTHALPY CHANGE IN COMBUSTION

Objective:
Determine the Enthalpy change of combustion ΔHc of three different alcohols. Methanol, Ethanol and Isopropilic acid.

Procedure:

1. Fill the spirit micro burner with Ethanol and weight it 2. Pour 100 cm3 of water into the aluminum cup 3. Arrange the cup a short distance over the micro burner 4. Measure the temperature of water 5. When the temperature of the water has risen by 10°C, record the temperature. 6. Reweight the microburner. Record 7. Repeat steps 1 to 6 but now with Methanol 8. Repeat step 1 to 6 with Isopropilic acid.

Data and Processing Alcohols | Initial mass of microburner fill with alcohol (g)± 0.01 | Final mass of microburner fill with alcohol (g)± 0.01 | Initial temperature of water(°C)± 0.1 | Final temperature of water(°C)± 0.1 | Volume of water in metallic calorimeter (cm3) ±0.5 | Ethanol | 5.38 | 5.08 | 23.0 | 33.0 | 100.0 | Methanol | 5.33 | 4.94 | 24.0 | 34.0 | 100.0 | Isopropolic acid | 5.45 | 5.20 | 24.0 | 34.0 | 100.0 |

Find the mass of water

ρ=mv

ρ (density) H2O = 1.0 g /cm3

Calculate % Uncertainty in mass of water

As the mass of water is the same in the 3 alcohols the %uncertainty is the same for all the alcohols

Absolute uncertainty of the measuring cylindermass of water × 100 Calculating Δ mass change (alcohol’s burned mass)

(initial mass ± 0.01 g)-(final mass ± 0.01 g)

Calculating percentage uncertainty in alcohol burned mass

Absolute uncertainty of alcohol's burned massalcohol's burned mass × 100

Calculate the percentage uncertainty of alcohol burned moles

percentage uncertainty of alcohol burned mass+percentage uncertainty of alcohol`s molar mass

Calculating ΔH (enthalpy change)

ΔH=-mass of water x specific heat of water x Δ T of water mol of alcohol

* The specific heat for water is 4.18

=100x4.184x 10=4,184 J or 4,184 KJ exothermic

Methanol=

* H2O = 100 ml *

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