Experiment 9- Determination of the molar mass of magnesium by the eudiometric method PDF

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Summary

Practical report for Experiment 9...

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Experiment 9: Determination of the Molar Mass of Magnesium by the Eudiometric Method REPORT SHEET – Students must complete this report and upload onto the submission folder on MOODLE

Preyeshini Govender 220006701 29/06/2020 Monday 1 18 Aviksha

Name Student Number Date Lab Day Lab Number Seat Number TA in charge of Lab

Mark Pre-Lab

Prac

Deductions

RESULTS: Mass of magnesium 0.0525 g Temperature of the system 23.40 °C Atmospheric pressure 762 mm Hg Hydrostatic head 60 mm water Water vapour pressure (at temperature of system) 2.8770 kPa Volume of hydrogen 55 cm3

Total

Calculations Atmospheric pressure 101.3 kPa

Temperature 269.55 K

Hydrostatic correction 0.587 kPa

Corrected pressure for dry H2 97.84 kPa

Number of moles of H2 gas 0.002178 mol nMg: nH2 1:1 x : 0.002178 x =0.002178 mol of Mg Number of moles of Mg metal 0.002178 mol Mm = m ÷ 𝑛 = 0.0525 ÷ 0.002178 =24.10 g/mol Molar mass of Mg (calculated) 24.10 g mol-1

Molar mass of Mg (theoretical) 24.31 g mol-1

% error = [ =

𝑑𝑙𝑙𝑖𝑡−𝑑𝑒𝑥𝑝

24.31−24.10 24.31

𝑑𝑙𝑖𝑡

] × 100

× 100

=0.8527% Percentage error 0.8527%

End of report...