The number of moles present in 168 g of HSO is

Explanation

To find the number of moles present in 168 g of HSO, we can follow these steps:

### Step 1: Determine the molar mass of HSO
The molar mass is calculated by adding the atomic masses of each element in the compound HSO.

- Atomic mass of Hydrogen (H) = 1 g/mol
- Atomic mass of Sulfur (S) = 32 g/mol
- Atomic mass of Oxygen (O) = 16 g/mol

Now, we can calculate the molar mass of HSO:
\[ \text{Molar mass of HSO} = \text{Atomic mass of H} + \text{Atomic mass of S} + \text{Atomic mass of O} \]
\[ \text{Molar mass of HSO} = 1 + 32 + 16 = 49 \text{ g/mol} \]

### Step 2: Use the formula to calculate the number of moles
The number of moles (n) can be calculated using the formula:
\[ n = \frac{\text{Given mass}}{\text{Molar mass}} \]
Here, the given mass is 168 g and the molar mass we calculated is 49 g/mol.

Substituting the values into the formula:
\[ n = \frac{168 \text{ g}}{49 \text{ g/mol}} \]

### Step 3: Perform the calculation
Now, we perform the division:
\[ n = \frac{168}{49} = 3.42857 \text{ moles} \]

### Step 4: Round the answer
For practical purposes, we can round the answer to three significant figures:
\[ n \approx 3.43 \text{ moles} \]

### Final Answer
The number of moles present in 168 g of HSO is approximately **3.43 moles**.

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