# Mole and Percent Worksheet

1. How many pennies are in a mole of pennies? How many thousand-dollar bills (k-notes!) is that mole of pennies equal to?

2. NO2 is the molecular formula for nitrous dioxide (also known as nitrogen dioxide). List the information available to you from this formula.

3. C2H2 is the molecular formula for ethyne (A.K.A. acetylene). (a) How many atoms are in one molecule (b) Which atoms make up acetylene (c) How many moles of atoms are in one molecule of acetylene (d) How many molecules are in 5.3 moles of acetylene (e) How many atoms are in a mole of acetylene

4. Calculate the molar mass of a mole of the following materials: (a) Al (b) Ra (c) Co (d) CO (e) CO2 (f) HCl (g) Na2CO3 (h) Ca(NO3)2 (i) (NH4)3(PO4) (j) H2O (k) Epsom salts - Mg(SO4) · 7H2O (m) blue vitriol - Cu(SO4) · 5H2O

5. Calculate the number of moles in: (a) 2.3 # of carbon (b) 0.014 g of Tin (c) a 5 Oz silver bracelet (d) a pound of table salt (e) a 350 kg cast iron engine block (f) a gal. of water (8.3 #) (g) a ton of sand (SiO2) (h) 6.2 grams of blue vitriol (i) a pound of Epsom salts

6. Calculate the number of atoms in: (a) 100 g of Argon (b) 1.21 kg aluminum foil (c) a 28 # lead brick (d) the E7 kg of water in an Olympic swimming pool (e) 7 kg of hydrogen gas (f) a tonne of calcium nitrate

7. What is the percentage composition of oxygen in each of the following materials: (a) CO (b) CO2 (c) (NO3)- (d) isopropyl alcohol C3H8O (e) calcium nitrate (f) blue vitriol - Cu(SO4) · 5H2O

8. What is the percentage composition of phosphate in each of the following materials: (a) phosphoric acid (b) sodium carbonate (c) ammonium phosphate (d) calcium phosphate

9. What is the percentage composition of sulfate in each of the following materials: (a) sulfuric acid (b) sodium sulfate (c) Epsom salts (d) aluminum sulfate

## Answers to Mole and Percent Problems

 1a. 6.023 E23 pennies 1b. 6.023 E18 k-Notes 2a. Covalent 2b. Elements in it (N and O) 2c. Number of atoms of each element 3a. 4 3b. C & H 3c. 6.64 E-24 3d. 3.1922 E24 3e. 2.4092 E24 4a. 27.0 4b. 226.0 4c. 58.9 4d. 28.0 4e. 44.0 4f. 36.5 4g. 106.0 4h. 164.1 4i. 149.0 4j. 18.0 4k. 246.4 4m. 249.6 5a. 86.9 5b. 1.18 E-4 5c. 1.31 5d. 7.75 5e. 6.27 E3 5f. 210 5g. 1.51 E4 5h. 0.0248 5i. 1.84 6a. 1.51 E24 6b. 2.69 E25 6c. 3.69 E25 6d. 1.00 E33 6e. 4.22E27 6f. 3.30 E28 7a. 57.1% 7b. 72.7% 7c. 77.4% 7d. 26.7% 7e. 58.5% 7f. 57.7% 8a. 96.9% 8b. 0% 8c. 63.8% 8d. 61.2% 9a. 98.0% 9b. 67.6% 9c. 39.0% 9d. 84.2%
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