4- 2 Fe + 3 H2O → Fe2O3+ 3 H2
| . | reactants | products |
|---|---|---|
| Fe | 1 2 | 2 |
| H | 2 6 | 2 6 |
| O | 1 3 | 3 |
5- CS2 + 3 O2 → CO2 + 2 SO2
| . | reactants | products |
|---|---|---|
| C | 1 | 1 |
| S | 2 | 1 2 |
| O | 2 4 6 | 4 6 |
6- C4H10 + 9 O2 → 4 CO2 + 10 H2O
| . | reactants | products |
|---|---|---|
| C | 4 | 1 4 |
| H | 10 | 2 10 |
| O | 2 18 | 3 18 |
7- 2 Al + 3 H2SO4 - > Al2(SO4)3 + 3 H2
| . | reactants | products |
|---|---|---|
| Al | 1 2 | 2 |
| H | 2 6 | 2 6 |
| SO4 | 1 3 | 3 |
2+3+1+3 9
8- P4 + 6 Ca → 2 Ca3P2
| . | reactants | products |
|---|---|---|
| P | 4 | 2 4 |
| Ca | 1 6 | 3 6 |
1,6,2 Synthesis
9- Sodium phosphate and calcium chloride are mixed to form sodium chloride and calcium phosphate
2 Na3(PO4) + 3 CaCl2 → 6 NaCl + Ca3(PO4)2
| . | reactants | products |
|---|---|---|
| Na | 3 6 | 1 6 |
| Ca | 1 3 | 3 |
| Cl | 2 6 | 1 6 |
| PO4 | 1 2 | 2 |
10- Potassium sulfate and barium chloride are mixed to form potassium chloride and barium sulfate.
K2SO4 + BaCl2 → 2 KCl + BaSO4
| . | reactants | products |
|---|---|---|
| K | 2 | 1 2 |
| SO4 | 1 | 1 |
| Ba | 1 | 1 |
| Cl | 2 | 1 2 |
11- Ammonia can be prepared by the reaction of magnesium nitride with water. The prod- ucts are ammonia and magnesium hydroxide
Mg3N2 + 6 H(OH) → 2 NH3 + 3 Mg(OH)2
| . | reactants | products |
|---|---|---|
| Mg | 3 | 1 3 |
| N | 2 | 1 2 |
| H | 1 6 | 3 6 |
| OH | 1 6 | 2 6 |
10- The complete combustion (reaction with oxy- gen) of liquid octane (C8H18) a component typical of the hydrocarbons in gasoline, pro- duces carbon dioxide gas and water vapor. What is the coefficient of carbon dioxide gas in the balanced equation for the reaction? (Balance the equation with the smallest pos- sible whole number coefficients.)
2 C8H18 + 25 O2 → 16 CO2 + 18 HOH
| . | reactants | products |
|---|---|---|
| C | 8 | 1 8 |
| H | 18 | 2 18 |
| O | 2 | 3 25 |