How many atoms do you think are in these compounds?

Question

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