1. What is Formula Mass?

Formula mass (or molecular mass) is the sum of the atomic masses of all atoms in a chemical formula. For urea (CO(NH₂)₂), it represents the mass of one mole of urea molecules.

2. How to Calculate Formula Mass

The formula mass calculation for urea:

Where:

• Carbon (C): 12.01 g/mol × 1 atom = 12.01 g/mol
• Oxygen (O): 16.00 g/mol × 1 atom = 16.00 g/mol
• Nitrogen (N): 14.01 g/mol × 2 atoms = 28.02 g/mol
• Hydrogen (H): 1.008 g/mol × 4 atoms = 4.032 g/mol

Explanation: Sum all atomic masses according to their stoichiometric coefficients in the molecular formula.

3. Urea Molecular Structure

Details: Urea (CO(NH₂)₂) is an organic compound with a carbonyl group (C=O) attached to two amine groups (-NH₂). It's widely used in fertilizers and chemical industries.

4. Using the Calculator

Tips: Enter the number of each type of atom in your molecular formula. The calculator will compute the total molar mass using standard atomic weights.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between formula mass and molecular mass?
A: Formula mass refers to ionic compounds, while molecular mass refers to covalent compounds. For urea, both terms are applicable.

Q2: Why is urea's molar mass important?
A: It's essential for stoichiometric calculations, solution preparation, and understanding urea's physical and chemical properties.

Q3: Can I calculate formula mass for other compounds?
A: Yes, simply input the correct number of each atom type for any chemical compound.

Q4: What are the atomic masses used in calculation?
A: Standard atomic weights: C=12.01, O=16.00, N=14.01, H=1.008 g/mol (based on IUPAC values).

Q5: How accurate is this calculation?
A: Very accurate for most applications. For precise analytical work, consider isotopic distributions and exact mass calculations.