Calculate the mass in grams of 0.15 mole of `H_2S`.

Options

A. 4.5g
B. 5.1g
C. 6.7g
D. 2.4g

Explanation

To calculate the mass in grams of 0.15 mole of \( H_2S \), we can follow these steps:

### Step 1: Determine the Molar Mass of \( H_2S \)

1. **Identify the elements in \( H_2S \)**:
- Hydrogen (H)
- Sulfur (S)

2. **Find the atomic masses**:
- Atomic mass of Hydrogen (H) = 1 g/mol
- Atomic mass of Sulfur (S) = 32 g/mol

3. **Calculate the molar mass of \( H_2S \)**:
- There are 2 hydrogen atoms, so the contribution from hydrogen is:
\[ 2 \times 1 = 2 \text{ g/mol} \]
- The contribution from sulfur is:
\[ 32 \text{ g/mol} \]
- Therefore, the total molar mass of \( H_2S \) is:
\[ 2 + 32 = 34 \text{ g/mol} \]

### Step 2: Use the Molar Mass to Calculate the Mass

1. **Use the formula for mass**:
\[ \text{mass} = \text{moles} \times \text{molar mass} \]

2. **Substitute the values**:
- Moles of \( H_2S \) = 0.15 moles
- Molar mass of \( H_2S \) = 34 g/mol
\[ \text{mass} = 0.15 \text{ moles} \times 34 \text{ g/mol} \]

3. **Calculate the mass**:
\[ \text{mass} = 5.1 \text{ grams} \]

### Final Answer
The mass of 0.15 mole of \( H_2S \) is **5.1 grams**.

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