Molar Relationship Lab Report

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Lab #4- Molar Relationships INTRODUCTION The mole is an important concept in chemistry. This unit is the measure of atoms or particles present in a compound, which is represented by Avogadro’s number, 6.022*1023. Avogadro’s number can be used in conjunction with other measures, like mass, to determine the number of particles in a compound. This allows chemists to learn more about how a compound may react or the behaviors of different chemicals. Another important concept in chemistry in the molar mass of elements and compounds. The molar mass of elements and compounds represents the mass of one mole of that particular particle. For a compound, the molar mass is simply the total of the molar mass of each atom present in the compound. By understanding …show more content…

MATERIALS AND PROCEDURE Materials: Sealed plastic bags of unknown compounds Empty plastic bags Electronic balance Periodic table Procedure: Calculate the molar mass of each of the seven known compounds by adding the molar mass of each element proportionally. Use a periodic table as a guide. Weigh one empty plastic bag on an electronic balance and record the mass on the data table. Weigh the sealed plastic bag filled with unknown compound A using the electronic balance and record the mass. Repeat this step for a second trial. Calculate the average mass of the bag including unknown A for accuracy. Record the data. Subtract the mass of the empty bag from the average weighed mass of the bag of substance A to find the mass of the substance alone. Record this data on the table. Divide the mass of unknown A by its respective amount of moles to find its molar mass. Record the data. Repeat steps 3-6 for unknowns B, C and D. Compare the unknowns’ molar masses to each known compound’s molar mass in order to determine its identity. DATA AND OBSERVATIONS Known Compounds Compound Molar Mass

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