Calculate the actual mass of :
a molecule of `NH_(3)`

Explanation

To calculate the actual mass of a molecule of \( NH_3 \) (ammonia), we will follow these steps:

### Step 1: Determine the atomic masses of the elements in \( NH_3 \)
- The molecule \( NH_3 \) consists of one nitrogen (N) atom and three hydrogen (H) atoms.
- The atomic mass of nitrogen (N) is approximately 14 amu (atomic mass units).
- The atomic mass of hydrogen (H) is approximately 1 amu.

### Step 2: Calculate the total mass of the molecule in amu
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