1. What is Molecular Weight?

Molecular weight (or molecular mass) is the sum of the atomic weights of all atoms in a molecule. It's expressed in atomic mass units (u) or grams per mole (g/mol).

2. How Does the Calculator Work?

The calculator uses the formula:

Process:

1. Parses the chemical formula into elements and their counts
2. Looks up each element's atomic weight
3. Multiplies each atomic weight by the element count
4. Sums all values to get the total molecular weight

3. Importance of Molecular Weight

Applications: Essential for stoichiometric calculations, preparing molar solutions, determining empirical formulas, and analyzing mass spectrometry data.

4. Using the Calculator

Instructions: Enter a chemical formula using standard notation (e.g., H2O, C6H12O6, CH3COOH). Case matters - element symbols start with uppercase letters.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molecular and formula weight?
A: Molecular weight refers to molecules, while formula weight is used for ionic compounds. The calculation method is identical.

Q2: How accurate are these calculations?
A: The calculator uses standard atomic weights. For precise work, use isotope-specific weights if needed.

Q3: Can I calculate weights for complex formulas?
A: Yes, but ensure proper formatting (e.g., (NH4)2SO4 should be entered as N2H8SO4).

Q4: Why are some atomic weights not whole numbers?
A: Atomic weights account for natural isotope abundance, which varies for most elements.

Q5: What if my element isn't recognized?
A: The calculator includes common elements. For uncommon elements, please consult a comprehensive periodic table.