Complete the following problems:



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Moles/Mass/Molecules Practice Problem Worksheet

Complete the following problems:

1. Convert 11.03 moles of calcium nitrate to grams.

2. How many molecules are contained in 103.4g of sulfuric acid?

3. 3.25 x 1024 molecules of dinitrogen pentoxide would be how many moles?

4. What would be the mass of 9.03 x 1021 molecules of hydrobromic acid?

5. A sample of iron (III) chloride has a mass of 26.29g. How many moles would this be?

Complete the following problems - Answers

1. Convert 11.03 moles of calcium nitrate to grams.

11.03 mol Ca(NO3)2 164.1g Ca(NO3)2

= 1810.02g Ca(NO3)2

1 mol Ca(NO3)2

2. How many molecules are contained in 103.4g of sulfuric acid?

103.4g H2SO4 1 mol H2SO4 6.02 x 1023 molecules H2SO4

= 6.35 x 1023 molecules H2SO4

98.08g H2SO4 1 mol H2SO4

3. 3.25 x 1024 molecules of dinitrogen pentoxide would be how many moles?

3.25 x 1024 molecules N2O5 1 mol N2O5

= 5.40 mol N2O5

6.02 x 1023 molecules N2O5

4. What would be the mass of 9.03 x 1021 molecules of hydrobromic acid?

9.03 x 1021 molecules HBr 1 mol HBr 80.91g HBr

= 1.21g HBr

6.02 x 1023 1 mol HBr

molecules HBr

5. A sample of iron (III) chloride has a mass of 26.29g. How many moles would this be?

26.29g FeCl3 1 mol FeCl3

= .16 mol FeCl3

162.2 g FeCl3

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