| Example 3: When 12 grams of NaOH are added to 16 grams of HCl, 7 grams of H2O and some amount of NaCl are formed. Find the mass of NaCl formed. | |
| Write the equation | NaOH + HCl → H2O + NaCl |
| Place the masses of the given substance below the equation | 12g + 16g → 7g + ??? |
| Apply the law of conservation of mass | 12g + 16g = 7g + ? |
| Solve for the missing mass | 28g - 7g = ? |
Answer: 21g | |