You performed an experiment to determine the molar mass of an unknown substance, and you have the following data that are only partially processed.Trial Mass / g Amount / mol111.1351.1350.02030.0203221.1281.1280.02020.0202331.1151.1150.01900.0190441.1291.1290.02020.0202Identify the outlier that should be omitted from calculations. Answer with the number of the trial (1, 2, 3 or 4).
Question
You performed an experiment to determine the molar mass of an unknown substance, and you have the following data that are only partially processed.Trial Mass / g Amount / mol111.1351.1350.02030.0203221.1281.1280.02020.0202331.1151.1150.01900.0190441.1291.1290.02020.0202Identify the outlier that should be omitted from calculations. Answer with the number of the trial (1, 2, 3 or 4).
Solution
The outlier in this data set can be identified by calculating the molar mass for each trial and then comparing these values. The molar mass is calculated by dividing the mass by the amount.
For trial 1: Molar mass = 11.135 g / 0.0203 mol = 548.28 g/mol
For trial 2: Molar mass = 11.128 g / 0.0202 mol = 550.89 g/mol
For trial 3: Molar mass = 11.115 g / 0.0190 mol = 585.53 g/mol
For trial 4: Molar mass = 11.129 g / 0.0202 mol = 551.09 g/mol
Looking at these values, it's clear that the molar mass calculated for trial 3 is significantly higher than the others. Therefore, trial 3 is the outlier and should be omitted from further calculations.
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