TABSA 2014
Homework Mole Worksheet
Name:
Period:
1. Calculate the molar mass of the following substances:
a) NH3
b) (NH4)2Cr2O7
2. What amount (moles) of compound is present in 1.00 g of each of the compounds in #1a,b?
3. What mass of compound is present in 5.00 mol of each of the compounds in #1a,b?
4. What number of molecules is present in 1.00 g of the compound in #1a?
5. What number of atoms of nitrogen is present in 1.00 g of the compound in #1b?
6. What number of Fe atoms is present in 500.0 g of iron?
7. Calculate the mass of 500 atoms of iron (Fe).
8. Aspartame is an artificial sweetener that is 169 times sweeter then sucrose (table sugar) when
dissolved in water. It is marketed as Nutra-sweet. The molecular formula of aspartame is
C14H18N2O5
a) Calculate the molar mass of aspartame.
b) What amount (moles) of molecules is present in 10.0 g aspartame?
c) Calculate the mass in grams of 1.56 mol aspartame.
d) What number of molecules is in 5.00 mg aspartame?
e) What number of atoms of nitrogen is in 1.2 g aspartame?
f) What is the mass in grams of 1.0 x 109 molecules of aspartame?
9. a) What volume does 0.38 moles of Fluorine gas occupy at STP?
b) What is the mass of 120L Fluorine gas at STP?
10. Calculate the percent composition by mass of the following compounds that are
important for starting materials for synthetic polymers:
a) C3H4O2 (acrylic acid, from which acrylic plastics are made)
b) C3H3N (acrylonitrile, from which Orlon is made)
11. The compound adrenaline contains 56.79% C, 6.56& H, 28.37% O, and 8.28% N by
mass. What is the empirical formula for adrenaline?
12. A sample of urea contains 1.121 g N, 0.161 g H, 0.480 g C and 0.640 g O. What is the
empirical formula of urea?
13. A compound containing only Sulfur and Nitrogen is 69.9% S by mass; the molar mass is
184 g/mol. What are the empirical and molecular formulas of the compound?
14. Adipic acid is an organic compound composed of 49.31% C, 43.79% O, and the rest
hydrogen. If he molar mass of adipic acid is 146.1 g/mol, what are the empirical and
molecular formulas for adipic acid?
15. Complete the following table for an ideal gas:
P(atm)
V(L)
n(mol)
T
2.00
155C
a.
5.00
b.
0.300
2.00
c.
4.47
25.0
2.01
2.25
10.5
d.
155K
75C
16. A 2.50 L container is filled with 175 g argon.
a. If the pressure is 10.0 atm, what is the temperature?
b. If the temperature is 225 K, what is the pressure?
ANSWERS: 1a. 17g/mol 1b. 252.1g/mol 2. 0.0587mol 3.97x10-3mol 3. 85.2g 1260g 4. 3.54x1022 molecules 5. 4.78x1021 atoms N
6. 5.39x1024 atoms 7. 4.64x10-20g 8a. 294.3 g/mol 8b. 3.4x10-2mol 8c. 459g 8d. 1.0x1019molecules 8e. 4.9x1021atoms 8f. 4.9x10-13g
9a. 8.51L 9b. 203.6g F2 10a. 50.0% C 5.6% H 44.4% O 10b. 67.9% C 5.7% H 26.4% N 11. C8H11O3N 12. N2H4CO 13. SN S4N4
14. C3H5O2 C6H10O4 15a. 14.0L 15b. 4.72x10-2 mol 15c. 678K 15d. 133atm 16a. 69.6K 16b. 32.3atm