A gas jar contains 1.7 g of ammonia gas. Calculate the following: a) Number of moles of ammonia present in the gas jar.

Answer

To solve the problem of calculating the number of moles of ammonia gas (NH₃) present in a gas jar containing 1.7 grams of ammonia, we will follow these steps:

### Step 1: Determine the Molar Mass of Ammonia (NH₃)
The molar mass of ammonia is calculated by adding the atomic masses of its constituent elements:
- Nitrogen (N): 1 atom × 14 g/mol = 14 g/mol
- Hydrogen (H): 3 atoms × 1 g/mol = 3 g/mol

Now, we sum these values:
\[ \text{Molar mass of NH₃} = 14 \, \text{g/mol} + 3 \, \text{g/mol} = 17 \, \text{g/mol} \]

### Step 2: Use the Formula to Calculate the Number of Moles
The number of moles (n) can be calculated using the formula:
\[ n = \frac{\text{Given mass}}{\text{Molar mass}} \]
In this case, the given mass of ammonia is 1.7 grams.

Substituting the values:
\[ n = \frac{1.7 \, \text{g}}{17 \, \text{g/mol}} = 0.1 \, \text{moles} \]

### Final Answer
The number of moles of ammonia present in the gas jar is:
\[ \text{Number of moles of NH₃} = 0.1 \, \text{moles} \]

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