1. What is Molar Mass?

Molar mass is the mass of one mole of a substance (chemical element or chemical compound). It is typically expressed in grams per mole (g/mol). For molecules, it's the sum of the atomic weights of all atoms in the molecule.

2. How to Calculate Molar Mass of NH3

The calculation follows these steps:

Where:

• Nitrogen (N) atomic weight = 14.007 g/mol (standard value)
• Hydrogen (H) atomic weight = 1.008 g/mol (standard value)
• NH3 contains 1 nitrogen atom and 3 hydrogen atoms

Example Calculation: Using standard atomic weights: 14.007 + (3 × 1.008) = 17.031 g/mol

3. Importance of Molar Mass

Details: Molar mass is crucial for stoichiometric calculations, converting between grams and moles, preparing chemical solutions, and determining empirical/molecular formulas.

4. Using the Calculator

Tips: Enter the atomic weights for nitrogen and hydrogen. Standard values are pre-filled. The calculator will show both the result and the step-by-step calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why are there different atomic weight values?
A: Atomic weights can vary slightly depending on the source and measurement precision. IUPAC provides standard values.

Q2: How accurate is this calculation?
A: The accuracy depends on the precision of the atomic weights used. Standard values are accurate to 3 decimal places.

Q3: Does this account for isotopic variations?
A: Standard atomic weights account for natural isotopic abundance. For precise work with specific isotopes, use exact isotopic masses.

Q4: Can I calculate molar mass for other compounds?
A: This calculator is specific for NH3. The same principle applies to other compounds but requires knowing their molecular formula.

Q5: Why is molar mass important for gases?
A: For gases, molar mass relates directly to density and is used in gas law calculations (PV=nRT).