Lab 8: Mole Baggie Lab

Summary/Purpose: The concept of using molar mass to identify compounds and convert units from grams to moles, or vice versa, is rather fundamental in chemistry. In this lab we were asked to identify mystery substances by finding their molar masses. For the A2 bag we identified the substance as Potassium Sulfate and for the B1 bag we identified the substance as Sodium Sulfate.

A2 Bag: 
We were given the mass of the empty plastic bag and how many moles of the compound was in the bag, but had to weigh the bag on a scale to find it's molar mass.

The measurements attained were:


To find the molar mass we did the following:


Out of the given possible compounds, the compound closest to 190 g/mol is Potassium sulfate, which is 174.26 g/mol.


B1 Bag: 
We were given the weight of the empty plastic bag and the number of molecules in the bag. Additionally, we had to find the weight of the bag with the substance using a scale.

The measurements attained were:


The molar mass of the substance is:

** Let "molecules" not necessarily be bonded covalently

Out of the given possible compounds, the compound closest to 150 g/mol is Sodium sulfate, which is 142.04 g/mol.

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