Name __________________________________ Hour______
The Mole Homework
Honors Chemistry—Due Thurs 11/3
Moles problem set I
1. Determine the molar mass of each of the following compounds
a. HClO3
c. Ca(NO3)2
b. (NH4)2S
d. UF6
2. Calculate the number of grams in 0.3 mol of each of the compounds listed in question one.
a. ____________
c. ____________
b. ____________
d. ____________
3. Calculate the number of moles contained in 100.0 g of each compound listed in question one.
a. ____________
c. ____________
b. ____________
d. ____________
4. In 3.01x1024 molecules of water:
a. How many moles of water are present?
b. How many grams of water are present?
5. How many atoms are in 2.4 mol of Copper?
6. Calculate the molar mass of:
a. NaHCO3
b. Mg(NO3)2
c. (NH4)3PO4
b. Mg(NO3)2
c. (NH4)3PO4
7. Calculate the mass of
a. 0.948 mol NaHCO3
b. 3.67 mol Mg(NO3)2
c. 2.94 mol (NH4)3PO4
8. Calculate the number of moles in
a. 9.67 g of NaHCO3
b. 38.4 g of Mg(NO3)2
c. 0.754 g of (NH4)3PO4
9. Calculate the percent composition of
a. NaHCO3
10. Calculate the number of grams of oxygen in 25.0g of
a. NaHCO3
b. Mg(NO3)2
c. (NH4)3PO4
MOLES PROBLEM SET II
1. Determine the molar mass of the following compounds
a. Fe3(PO4)2
b. Hemoglobin (C2952H4664O832S8Fe4)
2. Tin (II) fluoride is added to toothpaste to prevent tooth decay. In 24 g of SnF2, how many moles are present?
3. How many mol of benzene (C6H6) are present in 15.6 g benzene?
4. How many grams of NH4Cl are present in 0.4 mol of ammonium chloride?
5. Define molar mass
6. Calculate the molar mass of a compound if 0.22 mol of it weights 48 g.
7. Which sample contains the largest number o of hydrogen atoms?
a. 7.2 g H2O
b. 0.4 mol H2O
c. 0.8 g H2
d. 6.02 x 1023 molec H2
8. Which of the following has more atoms? 2.4 g of He or 10.4 g of Cr? Show your work.
9. Determine the molar mass of each of the following compounds
a. H2SO4
b. Cu(NO3)2
10. Calculate the number of grams contained in 0.42 mol of each of the compounds in question 9
a. _____________________
b. _____________________
11. How many sugar molecules (C6H12O6) are there in a sugar cube weighing 3.6 g?
12. Calculate the number of moles contained in 200.0 g of each compound listed in question ONE.
13. Calculate the percent composition of H2SO4
14. In 80 g of H2SO4 how many grams of S are present?
PERCENT COMPOSITION PRACTICE PROBLEMS
1. A 43.40 mg sample of alcohol contains 15.10 mg O, 22.6 mg C, and the rest is hydrogen. What is the percent
composition?
2. Ethyl mercaptan is an odorous substance added to natural gas to make leaks easily detectable. A sample of
ethyl mercaptan was composed of 1.64 g S, 1.23 g C, and 0.30 g hydrogen. What is the percent composition?
3. Calculate the percent composition of each of the following compounds
a. CO
c. KMnO4
b. CO2
d. Co(NO3)2
4. Cadaverine, one of the compounds responsible for the odor of decaying flesh, has the formula NH2CH2CH2 CH2
CH2 CH2NH2. What is the percent composition of cadaverine?
5. Which contains more carbon? 4.71 g of glucose (C6H12O6) or 5.85 g if ethanol (C2H6O)?
6. A sample of an alloy of aluminum contains 0.0972 mol of Al and 0.0381 mol Mg.
a. What is the percent composition?
b. How many grams of the alloy are needed to supply 150.0g of Al?
For the mole quiz on Thurs, be able to:
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Calculate the molar mass of a compound
Convert from mass moles
Convert from moles molecules
Convert from mass  molecules
Answer percent composition problems