2. How many moles are in 36.0 g of water $$ \left(\mathrm{H}_{2} \mathrm{O}\right) $$ ? A. 1.0 moles B. 0.5 moles C. 2.0 moles D. 6.0 moles

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To determine the number of moles in 36.0 grams of water ($$\mathrm{H}_2\mathrm{O}$$), you can use the following formula:

$$
\text{Number of moles} = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}}
$$

**Step 1: Calculate the Molar Mass of Water ($$\mathrm{H}_2\mathrm{O}$$)**

- **Hydrogen (H):** There are 2 hydrogen atoms in each water molecule.
  - Atomic mass of H ≈ 1.008 g/mol
  - Total for hydrogen: $$2 \times 1.008 \, \text{g/mol} = 2.016 \, \text{g/mol}$$

- **Oxygen (O):** There is 1 oxygen atom in each water molecule.
  - Atomic mass of O ≈ 16.00 g/mol

- **Total Molar Mass of $$\mathrm{H}_2\mathrm{O}$$:**
  $$
  2.016 \, \text{g/mol (H)} + 16.00 \, \text{g/mol (O)} = 18.016 \, \text{g/mol}
  $$

**Step 2: Calculate the Number of Moles**

$$
\text{Number of moles} = \frac{36.0 \, \text{g}}{18.016 \, \text{g/mol}} \approx 2.0 \, \text{moles}
$$

**Answer:**  
**C. 2.0 moles**
There are 2.0 moles in 36.0 grams of water. **Answer:** C. 2.0 moles

How many moles are in 36.0 g of water ?
A. 1.0 moles
B. 0.5 moles
C. 2.0 moles
D. 6.0 moles

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How many moles are in 36.0 g of water ? A. 1.0 moles B. 0.5 moles C. 2.0 moles D. 6.0 moles