Question

How many atoms do you think are in these compounds?

1. CO2

2. H2O

3. NaCl

4. NH3

5.CaCO3

6. C2H8O

Answer 1

To find the total number of atoms in each compound, we count the atoms of each element present in the formula. Here's the breakdown for each compound:

1. **CO2 (Carbon Dioxide)**:
- 1 carbon (C) atom
- 2 oxygen (O) atoms
- Total = 1 + 2 = **3 atoms**

2. **H2O (Water)**:
- 2 hydrogen (H) atoms
- 1 oxygen (O) atom
- Total = 2 + 1 = **3 atoms**

3. **NaCl (Sodium Chloride)**:
- 1 sodium (Na) atom
- 1 chlorine (Cl) atom
- Total = 1 + 1 = **2 atoms**

4. **NH3 (Ammonia)**:
- 1 nitrogen (N) atom
- 3 hydrogen (H) atoms
- Total = 1 + 3 = **4 atoms**

5. **CaCO3 (Calcium Carbonate)**:
- 1 calcium (Ca) atom
- 1 carbon (C) atom
- 3 oxygen (O) atoms
- Total = 1 + 1 + 3 = **5 atoms**

6. **C2H8O (Ethanol)**:
- 2 carbon (C) atoms
- 8 hydrogen (H) atoms
- 1 oxygen (O) atom
- Total = 2 + 8 + 1 = **11 atoms**

In summary:
1. CO2: **3 atoms**
2. H2O: **3 atoms**
3. NaCl: **2 atoms**
4. NH3: **4 atoms**
5. CaCO3: **5 atoms**
6. C2H8O: **11 atoms**