Find the number of moles and number of molecules in 56.735 g of H2O.

To find the number of moles and the number of molecules in 56.735 g of H₂O, we follow these steps:

### 1. Find the molar mass of H₂O:
The molar mass of H₂O is calculated by summing the atomic masses of hydrogen and oxygen:

- Hydrogen (H): 1.008 g/mol × 2 = 2.016 g/mol
- Oxygen (O): 16.00 g/mol

So, the molar mass of H₂O is:
\[
\text{Molar mass of H₂O} = 2.016 + 16.00 = 18.016 \, \text{g/mol}
\]

### 2. Calculate the number of moles:
The number of moles is calculated by dividing the given mass by the molar mass:
\[
\text{Number of moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{56.735 \, \text{g}}{18.016 \, \text{g/mol}} = 3.15 \, \text{mol}
\]

### 3. Calculate the number of molecules:
The number of molecules is calculated by multiplying the number of moles by Avogadro's number (\(6.022 \times 10^{23}\) molecules/mol):
\[
\text{Number of molecules} = 3.15 \, \text{mol} \times 6.022 \times 10^{23} \, \text{molecules/mol} = 1.90 \times 10^{24} \, \text{molecules}
\]

### Final Answer:
- Number of moles of H₂O = 3.15 mol
- Number of molecules of H₂O ≈ \(1.90 \times 10^{24}\) molecules

Would you like more details on any of these steps?

Here are 5 related questions:
1. How do you calculate the number of atoms in a molecule like H₂O?
2. What is Avogadro's number and why is it important?
3. How would you calculate the mass of a substance given its number of moles?
4. How do you convert moles of a compound into grams?
5. What is the concept of the mole in chemistry?

**Tip:** Always ensure that units cancel out properly when performing calculations. This helps avoid errors.

Learn how to calculate the number of moles and molecules in 56.735 g of water (H2O). This tutorial explains key chemistry concepts like molar mass, moles, and Avogadro's number, with step-by-step calculations. Ideal for high school chemistry students in Grades 9-12.

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