Chemistry Unit 5 Worksheet 1: The Mole Name:

Chemistry Unit 5 Worksheet 1: The Mole

Name: ____________

The picture below shows two pairs of gloves. How many gloves are there in total?

Answer: ______ gloves

The picture below shows a carton of one dozen eggs. How many eggs are there? Answer: ______ eggs.

The picture below shows a carton of three dozen eggs. How many eggs are there? Answer: ______ eggs

In chemistry, we talk about atoms and molecules, which are very, very small. One mL of water contains about 33,460,000,000,000,000,000,000 molecules of water. It's a very big number!

So chemists use the word: the ________ to describe how many atoms or molecules they

have.

1 ________ = ________________________ of something.

1. I have 1 mol of apples. How many apples do I have? 2. You have 2 mol of apples. How many apples do you have? 3. I have 0.5 mol of apples. How many apples do I have?

4. There is 1 mol of He atoms in this balloon. How many He atoms are there?

5. There are 5 mol of H2O molecules in this cup. (a) How many H2O molecules are in the cup?

(b) How many H atoms are in this cup?

(c) How many O atoms are in this cup?

1 All worksheets must be completed before Binder Check.

More Practice

Work each of the following problems. SHOW ALL WORK. 1. How many atoms are in 6.2 moles of aluminum?

2. What is the mass of 0.38 moles of cobalt (Co)?

3. How many moles of nickel (Ni) is 3.88 x 1025 atoms of nickel?

4. If you have 7.22 x 1023 atoms of chromium (Cr), how many moles of chromium do you have?

Molar Mass

The mass, in grams, of one mole (of a substance) is called the ___________________. The molar mass of any element is numerically equal to its _____________________ which is shown on the periodic table. Units of the molar mass: grams per mole _________. The molar mass of any compound is numerically equal to the sum of the _____________________ of every element in the compound, which is shown on the periodic table.

5. How many grams is 1 mol of silicon atoms?

6. What is the mass (in grams) of 1 mol of CO2?

7. Use the periodic table to find the molar masses of the following.

(a) HCl

molar mass: ___________ (b) K2CO3

(c) Ca(OH)2 molar mass: ___________ (d) Na3PO4

molar mass: ___________ molar mass: ___________

8. How many moles are in 100 g of water?

9. How many moles is 0.55 g of magnesium (Mg)?

10. How many moles are represented by 11.5 g of C2H5OH? 2

All worksheets must be completed before Binder Check.

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