2. Complete Activity 3.2 (Page 31).
• Refer to Table 3.4 for ratio by mass of atoms present in molecules and Table 3.2 for atomic masses of elements. Find the ratio by number of the atoms of elements in the molecules of compounds given in Table 3.4.
Answer:
The table is shown below:
Table 3.4 : Molecules of some compounds
| Compound | Combining Elements | Ratio of Mass |
| Water (H2O) | Hydrogen, Oxygen | 1:8 |
| Ammonia (NH3) | Nitrogen, Hydrogen | 14:3 |
| Carbon dioxide (CO2) | Carbon, Oxygen | 3:8 |
Thus, the ratio by number of atoms for water is H:O = 2:1.
Thus, the ratio by number of atoms for ammonia is N:H = 1:3.
Thus, the ratio by number of atoms for ammonia is C:O = 1:2.
“Refer to Table 3.4 for ratio by mass of atoms present in molecules and Table 3.2 for atomic masses of elements. Find the ratio by number of the atoms of elements in the molecules of compounds given in Table 3.4.” – Solved.
Related Links:
Solution to Group Activity
Solution to Activity 3.1
Solution to Activity 3.2
Solutions to Chapter 3 Atoms and Molecules
