Calculate the mass in grams of 0.19 mole of `H_2S`.

Explanation

To calculate the mass in grams of 0.19 moles of \( H_2S \), we can follow these steps:

### Step 1: Determine the Molar Mass of \( H_2S \)
- The molar mass of a compound is calculated by adding the atomic masses of all the atoms present in the molecule.
- For \( H_2S \):
- Hydrogen (H) has an atomic mass of approximately 1 g/mol. Since there are 2 hydrogen atoms, the contribution from hydrogen is:
\[ 2 \times 1 = 2 \text{ g/mol} \]
- Sulfur (S) has an atomic mass of approximately 32 g/mol. Therefore, the contribution from sulfur is:
\[ 32 \text{ g/mol} \]
- Adding these together gives the molar mass of \( H_2S \):
\[ \text{Molar mass of } H_2S = 2 + 32 = 34 \text{ g/mol} \]

### Step 2: Use the Molar Mass to Calculate the Mass
- We know that the mass of a substance can be calculated using the formula:
\[ \text{Mass} = \text{Number of moles} \times \text{Molar mass} \]
- Given that we have 0.19 moles of \( H_2S \), we can substitute the values into the formula:
\[ \text{Mass} = 0.19 \text{ moles} \times 34 \text{ g/mol} \]

### Step 3: Perform the Calculation
- Now, we calculate the mass:
\[ \text{Mass} = 0.19 \times 34 = 6.46 \text{ grams} \]

### Final Answer
The mass of 0.19 moles of \( H_2S \) is **6.46 grams**.

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