Moles Lab

Part A:

Procedure:

1. Fill the cup about 3/4 full of water and find the mass.
2. Swallow one mouthful of water from the cup and find the new mass.
3. Subtract the mass in Step 2 from the mass in Step 1 to find the mass of water contained in one mouthful.
4. Calculate the molar mass of water by adding the molar masses of the 2 hydrogen atoms and the 1 oxygen atom present in the compound.
5. Divide the mass you calculated in Step 3 by the molar mass of water.
6. Multiply the mass calculated in Step 5 by one mole (6.02 x 10^23) to convert to molecules in one mouthful.

Conclusion: The purpose of this lab was to determine the number of water molecules in a mouthful of water. We found the mass of one mouthful of water by finding the difference between the mass of a cup full of water and the same cup after we'd swallowed one mouthful. By multiplying that value by the value of one mole, then dividing by the molar mass of water, we concluded that there are roughly 1.5825 x 10^24 molecules of water in one mouthful.

	Mass in Grams
Cup with all water	176.29 g
Cup with water remaining after swallowing mouthful	128.93 g

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Part B:

Purpose: Determine the amount of sugar cubes needed to contain 1.18 x 10^22 molecules of sugar.

Procedure:

1. Find the mass of one sugar cube.
2. Multiply the mass by one mole (6.02 x 10^23).
3. Calculate the molar mass of sugar by adding the molar mass of each element multiplied by the number of atoms of that specific element in the compound.
4. Divide the molar mass of sugar, by the number calculated in Step 2.
5. Multiply the value from Step 3 by the desired number of sugar molecules (1.18 x 10^22).

Conclusion: The purpose of this lab was to determine the amount of sugar cubes needed to contain 1.8 x 10^22 molecules of sugar. By dividing the mass of one mole of sugar by the amount of sugar in one cube multiplied by the value of one mole, we concluded that 1.8742 sugar cubes are needed to contain that many molecules of sugar.

	Mass in Grams
1 sugar cube	3.58 g