Measuring Mass by Moles Lab



Name:_________________________________________ Period:___________

Measuring Mass by Moles Lab

Purpose: To determine the mass of several compound samples and use the data to count moles & molecules.

Sample #1 Water (H2O)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. Suppose you had a sample of this substance that contained 3.35x1015 molecules. How many grams would it weigh?

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Sample #2 - Calcium Chloride (CaCl2)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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Sample #3 - Sodium Chloride (NaCl)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. Suppose you had a sample of this substance that contained 7.89 moles. How many grams would it weigh?

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Sample #4 - Calcium Phosphate (animal skull) Ca3(PO4)2

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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Sample #5 – Glass (SiO2)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. Suppose you had a sample of this substance that contained 0.756 moles. How many grams would it weigh?

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Sample #6 – Aluminum Foil (Al)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. Suppose you had a sample of this substance that contained 1.43x1034 molecules. How many grams would it weigh?

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Sample #7 – Calcite (Calcium Carbonate) CaCO3

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. Suppose you had a sample of this substance that contained 1.87x109 molecules. How many grams would it weigh?

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Sample #8 – Railroad Spike (Iron (III) Oxide) Fe2O3

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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Sample #9 – Jolly Rancher candy (Sucrose = C12H22O11)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. How many molecules of sucrose would you ingest if you ate 3 jolly ranchers?

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Sample #10– Rolaids (Magnesium Hydroxide) Mg(OH)2

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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Sample #11 – Baking Soda (Sodium Bicarbonate) NaHCO3

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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Sample #12 – Candle (Paraffin = C25H52)

1. Calculate the molar mass for this compound (the number of grams in one mol). _____________

2. How many moles of this compound do you have? (Show work below)

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3. How many molecules are there in your sample? (Show work below)

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4. Another candle has a mass of 1.5g. Assuming it is solid paraffin, how many molecules does it contain?

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