# Stoichiometry: Avocado's Number (a.k.a. Guacamole) Quiz

Think you’ve got your head wrapped around Stoichiometry? Put your knowledge to the test. Good luck — the Stickman is counting on you!
Q. How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?

8.648 × 1023 moles
0.8452 moles
3.134 × 1025 moles
1.183 moles
6.023 × 1023 moles
Q. How many oxygen atoms are there in 52.06 g of carbon dioxide?

1.183 atoms
6.023 × 1023
1.425 × 1024
1.204 × 1024
2
Q. How many molecules of methane are in 0.123 moles of methane (CH4)?

2.46 × 10-2 molecules
7.40 ×1022
5
0.615
2.04 × 10-25
Q. Consider the following combustion reaction: C3H8 + 5 O2 → 3 CO2 + 4 H2O. When 2.5 moles of O2 are consumed in the reaction, how many moles of CO2 are produced?

1.5 moles
2.5 moles
5.0 moles
6.0 moles
3.0 moles
Q. Consider the following reaction: 4 NH3 + 5 O2 → 4 NO + 6 H2O. How many grams of O2 are required for the complete reaction of 162 g of NH3?

108 g
381 g
244 g
202 g
162 g
Q. What is the mass in grams of 5.90 moles of C8H18?

0.0512 g
19.4 g
389 g
673 g
None of the above
Q. What is the number of moles in 432 g of Ba(NO3)2?

0.237 moles
0.605 moles
1.65 moles
3.66 moles
None of the above
Q. What is the percent composition of chromium in BaCrO4?

4.87%
9.47 %
20.5 %
25.2%
None of the above
Q. Consider the following reaction: 2 Al + 3 FeO → 3 Fe + Al2O3. How many moles of Al2O3are produced when 0.60 moles of Fe is produced in the reaction?

0.20 moles
0.40 moles
0.60 moles
0.90 moles
None of the above
Q. Avogadro's number is equal to:

6.023 atoms or molecules
6.023 × 10-22
6.023 × 1022
6.023 × 10-23
6.023 × 1023