2. What is the total number of moles of sulfur atoms in 1 mole of Fe₂(SO₄)₃?
a) 1
b) 15
c) 3
d) 17

3. Which sample contains a total of 6.0 x 10²³ atoms?
a) 23 g Na
b) 24 g Ca
c) 42 g Kr
d) 78 g K

4. A 20.-milliliter sample of 0.60 M HCl is diluted with water to a volume of 40. milliliters. What is the new concentration of the solution?
a) 0.15 M
b) 0.60 M
c) 0.30 M
d) 1.2 M

5. Given the reaction:

4 Al_(s) + 3 O_2(g) 2 Al₂O_3(s)

What is the minimum number of grams of oxygen gas required to produce 1.00 mole of aluminum oxide?
a) 32.0 g
b) 48.0 g
c) 96.0 g
d) 192 g

6. What is the mass of 1 mole of a gas that has a density of 2.00 grams per liter at STP?
a) 11.2 g
b) 22.4 g
c) 33.6 g
d) 44.8 g

7. A compound was analyzed and found to contain 75% carbon and 25% hydrogen by mass. What is the compounds empirical formula?
a) CH
b) CH₂
c) CH₃
d) CH₄

8. What is the molar mass of Ca(OH)₂?
a) 29 g
b) 34 g
c) 57 g
d) 74 g

9. What is the empirical formula for C₃H₆?
a) CH
b) CH₂
c) CH₃
d) CH₆

10. What is the percent by mass of carbon in CO₂?
a) 12
b) 27
c) 44
d) 73

11. Given the reaction:

N_2(g) + 3 H_2(g) 2 NH_3(g)

What is the total number of moles of NH₃(g) produced when 10. moles of H₂(g) reacts completely with N₂(g)?
a) 6.7
b) 2.0
c) 3.0
d) 1.5

12. The volume occupied by 9.03 x 10²³ molecules of N₂ gas at STP is closest to
a) 0.500 liter
b) 1.50 liters
c) 22.4 liters
d) 33.6 liters

13. What is the total number of moles of atoms represented by the formula Al(C₂H₃O₂)₃?
a) 22
b) 11
c) 8
d) 4

14. Given the reaction:

C₃H_8(g) + 5 O_2(g) 4 H₂O_(g) + 3 CO_2(g)

What is the total number of liters of H₂O(g) produced when 1.0 liter of C₃H₈(g) reacts completely with 7.5 liters of O₂(g)?
a) 1.0
b) 5.0
c) 3.0
d) 4.0

15. Which substance has the greatest molecular mass?
a) H₂O₂
b) NO
c) CF₄
d) I₂

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