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Balancing Equations
Types of Reactions
Molar Conversions
Stoichiometry
100

Balance the equation:

___H2 + ___O2 --> ___H2O

2H2 + O2 --> 2H2O

100
2 Part:


A + B --> AB 

AB --> A + B

What is Synthesis?

and

What is Decomposition?

100

What is the volume of 2 moles of hydrogen gas at STP?

2 moles H2 x 22.4 L/1 mole = 44.8 L H2

100

For the following reaction:

2H2 + O2 --> 2H2O

If you start with 64 grams oxygen gas, how many moles of water will be produced?

64 g O2 x 1 mole/32 g x 2 mol H2O/1 mol O2 = 4.0 mol H2O

200
Predict the products and balance:

Synthesis

___Mg + ___O2 --> ________________
2Mg + O2 --> 2MgO
200

What type of reaction is this?


AB + C --> AC + B

Single Replacement Reaction

200

How many moles of sodium chloride are there in 1.204x1024 formula units?

1.204x1024 f.u. NaCl x 1 mole/6.02x1023 f.u. = 2 moles NaCl

200

For the following reaction:

2NaCl + F2 --> 2NaF + Cl2

If you start with 4 moles of sodium chloride, what volume of chlorine gas will be produced at STP?

4 mol NaCl x 1 mol Cl2/2 mol NaCl x 22.4 L/1 mol = 44.8 L Cl2 (Sig Figs: 40 L Cl2)

300
Predict the products and balance:

Double replacement

___NaCl + ___CaF2 --> ______________________
2NaCl + CaF2 --> CaCl2 + 2NaF
300

What type of reaction is this?

C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O

Combustion

300

What is the mass of 3 moles of carbon dioxide?

3 mol CO2 x 44.01 g/1 mol = 132.03 g (Sig Figs: 100 g)


C: 12.01g x 1 = 12.01g

O: 16g x 2 = 32g

300

2H2O --> 2H2 + O2

If you start with 18 g of water, how many r.p.s of hydrogen gas will be produced?

2H2O --> 2H2 + O2


18 g H2O x 1 mol/18.02 g x 2 mol H2/2 mol H2O x 6.02x1023 r.p./1 mol = 6.0x1023 r.p. H2

400
Write and balance an equation:

Combustion of dicarbon tetrahydride.
C2H4 + 3O2 --> 2CO2 + 2H2O
400

What type of reaction is this?

Al2O3 + 6 NaCl -->3 Na2O + 2 AlCl3

Double Replacement

400

What is the volume of 40 grams of water vapor (gas form of water) at STP?

40 g H2O x 1 mole/18.02 g x 22.4 L/1 mole = 49.7 L H2O (Sig Figs: 50 L H2O)


H: 1.01 g x 2 = 2.02 g

O: 16 g x 1 = 16 g

400

Balance the following combustion equation and then solve the stoichiometry problem:

___C3H4 + ___O2 --> ___CO2 + ___H2O

Given: 3 moles CO2

Unknown: ? g H2O

C3H4 + 4O2 --> 3CO2 + 2H2O


3 mol CO2 x 2 mol H2O/ 3 mol CO2 x 18.02 g/1 mol = 36.04 g H2O (Sig figs = 40 g H2O)

500
Write and balance an equation:

Single replacement reaction between zinc (II) oxide and sodium.
ZnO + 2Na --> Na2O + Zn
500

What type of reaction is this?

Barium fluoride reacts with copper (II) sulfide

Double replacement

500

How many molecules are there in 56 g of carbon monoxide?

56 g CO x 1 mol/28.01 g x 6.02x1023 molecules/1 mole = 1.2 x 1024 molecules CO

500

___MgO + ___S --> ___MgS (s) + ___O2 (g)

Balance the equation and do the stoichiometry problem below:

If the reaction starts with 16 g sulfur, how many grams of the solid product will be produced?

2MgO + 2S --> 2MgS + O2


16 g S x 1 mol/32.06 g x 2 mol MgS/ 2 mol S x 56.37 g/1 mol = 28 g MgS


mass MgS Mg: 24g x 1 = 24g S: 32g x 1 = 32g total= 56 g