Calculate the molar mass of H2O.
Understand the Problem
The question is asking to calculate the molar mass of water (H2O). To solve this, we need to sum the atomic masses of its constituent elements: hydrogen and oxygen, taking into account the number of each atom in the molecule.
Answer
The molar mass of water (H\(_2\)O) is $18.02 \, \text{g/mol}$.
Answer for screen readers
The molar mass of water (H(_2)O) is $18.02 , \text{g/mol}$.
Steps to Solve
- Identify the constituent elements and their quantities
Water (H(_2)O) is composed of two hydrogen (H) atoms and one oxygen (O) atom.
- Find the atomic mass of each element
The atomic mass of hydrogen is approximately 1.01 g/mol, and the atomic mass of oxygen is approximately 16.00 g/mol.
- Calculate the total mass contributed by hydrogen
Since there are two hydrogen atoms, multiply the atomic mass of hydrogen by 2:
$$ \text{Total mass from H} = 2 \times 1.01 , \text{g/mol} = 2.02 , \text{g/mol} $$
- Calculate the total mass contributed by oxygen
Since there is one oxygen atom, we simply take its atomic mass:
$$ \text{Total mass from O} = 1 \times 16.00 , \text{g/mol} = 16.00 , \text{g/mol} $$
- Add the total masses together
Now, add the total mass from hydrogen and the total mass from oxygen to find the molar mass of water:
$$ \text{Molar mass of H}_2\text{O} = 2.02 , \text{g/mol} + 16.00 , \text{g/mol} = 18.02 , \text{g/mol} $$
The molar mass of water (H(_2)O) is $18.02 , \text{g/mol}$.
More Information
Water is essential for all known forms of life and is often referred to as the "universal solvent" because it can dissolve more substances than any other liquid. The calculated molar mass of water is important in many fields, including chemistry and biology.
Tips
- Forgetting to account for the number of atoms when calculating the total mass of each element.
- Using incorrect atomic masses; it's important to check reliable sources for the most updated atomic weights.