R. Chem - Stoichiometry

Basic Calculations (formula mass, percent composition)

100

What is the formula mass of KOH?

56.11 grams

200

What is the formula mass of Al₂(SO₃)₃?

294.15 grams

300

What is the percent by mass of nitrogen in NH₄NO₃?

35%

400

What is the molecular formula of a compound with a molecular mass of 64 grams and an empirical formula of CH₄?

C₄H₁₆

500

What is the formula mass of iron III oxide?

159.69 grams

Balancing Equations

100

Balance this equation:

___H₂ + ___O₂ --> ___H₂O

2 H₂ + 1 O₂ --> 2 H₂O

200

Balance this equation:

___Al + ___O₂ --> ___Al₂O₃

4 Al + 3 O₂ --> 2 Al₂O₃

300

Balance this equation:

___NaCl + ___Mg --> ___Na + ___MgCl₂

2 NaCl + 1 Mg --> 2 Na + 1 MgCl₂

400

Balance this equation:

__C₄H₁₀ + __O₂ → __CO₂ + __H₂O

2 C₄H₁₀ + 13 O₂ → 8 CO₂ + 10 H₂O

500

Balance this equation:

___HClO₄ + ___P₄O₁₀ --> ___H₃PO₄ + ___Cl₂O₇

Cl is chlorine!!

12 HClO₄ + 1 P₄O₁₀ --> 4 H₃PO₄ + 6 Cl₂O₇

Intro to the Mole

100

What is Avogadro's number?

6.02x10²³

200

One mole of any gas at STP occupies what volume?

22.4 L

300

1 mole of carbon is equal to _____

12.01 grams of carbon

400

1 mole of NaCl is equal to ______

58.44 grams

500

In order to convert 4.76 moles of iron II oxide what piece of information do you need?

The formula mass

Mass --> MoleMole --> Mass

100

Convert 1.26 moles of LiF to grams of LiF

32.6 grams

200

Covert 45 grams of H₂O to moles of H₂O

2.5 moles

300

Convert 0.05 moles of H₂SO₄ to grams

4.91 grams

400

Convert 68 grams of O₂ to moles

2.125 moles

500

Convert 0.77 moles of CO₂ to grams

33.88 grams

Mole --> Mole

100

According to the balanced equation what is the ratio of carbon to iron?

2 Fe₂O₃ + 1 C --> 1 Fe + 3 CO₂

1:1

200

According to the balanced equation, if 14 moles of iron III oxide react how many moles of iron would be produced?

2 Fe₂O₃ + 1 C --> 1 Fe + 3 CO₂

7 moles

300

If 0.45 moles of carbon react, how many moles of carbon dioxide will be produced?

2 Fe₂O₃ + 1 C --> 1 Fe + 3 CO₂

1.35 moles of CO2

400

If 16 moles of carbon dioxide are produced how much iron III oxide will be needed?

2 Fe₂O₃ + 1 C --> 1 Fe + 3 CO₂

10.67 moles

500

If you want to produce 7.6 moles of carbon dioxide how many moles of carbon will need to react? How many moles of iron III oxide will need to react?

2 Fe₂O₃ + 1 C --> 1 Fe + 3 CO₂

2.53 moles of carbon

5.07 moles of iron III oxide