Does anyone know how to find mass of NaN3?
The Correct Answer and Explanation is :
The correct answer is: 65.02 g/mol
To find the mass of sodium azide (NaN₃), we need to calculate its molar mass first. The molar mass is the sum of the atomic masses of all the atoms in a molecule of NaN₃.
- Atomic masses:
- Sodium (Na): 22.99 g/mol
- Nitrogen (N): 14.01 g/mol
- Molecular formula of NaN₃: Na + 3N
Now, calculate the molar mass of NaN₃:
[
\text{Molar mass of NaN₃} = 1(\text{Na}) + 3(\text{N}) = 22.99 + 3(14.01) = 22.99 + 42.03 = 65.02 \, \text{g/mol}
]
The molar mass of NaN₃ is 65.02 g/mol.
Example Problem: Finding Mass from Moles
If you’re given a certain number of moles of NaN₃ and need to find the mass, use the formula:
[
\text{Mass} = \text{moles} \times \text{molar mass}
]
For example, if you have 0.5 moles of NaN₃, the mass would be:
[
\text{Mass} = 0.5 \times 65.02 = 32.51 \, \text{g}
]
Detailed Explanation
In any calculation involving molar mass, it’s essential to understand that the molar mass tells us how much one mole of a substance weighs. One mole of a substance contains ( 6.022 \times 10^{23} ) particles (atoms, molecules, etc.), which is known as Avogadro’s number. For NaN₃, one mole consists of one sodium atom and three nitrogen atoms.
To solve problems related to molar mass:
- Identify the molecular formula: For NaN₃, you have sodium and nitrogen in a 1:3 ratio.
- Determine the atomic masses of each element.
- Add up the atomic masses based on the number of atoms present in the molecule.
- Use this molar mass to convert between moles and mass.
This process is useful in many chemical calculations, such as determining how much of a reactant is needed in a reaction or calculating yields in product formation.