Molecular Weight Calculator

How to Use the Molecular Weight Calculator

This Molecular Weight Calculator helps you determine the molecular weight of a compound using the number of atoms of each element you input. Follow the steps below to use the calculator effectively.

Step 1: Input the Number of Atoms

• Hydrogen (H): Enter the number of hydrogen atoms in the compound. This field is not required, so leave it blank if there are no hydrogen atoms.
• Carbon (C): Enter the number of carbon atoms. This field is optional.
• Nitrogen (N): Enter the number of nitrogen atoms. It’s optional and can be left blank if there are no nitrogen atoms.
• Oxygen (O): Enter the number of oxygen atoms. This is also an optional field.
• Sulfur (S): If there are sulfur atoms, enter their number here. This field is optional.
• Phosphorus (P): Enter the number of phosphorus atoms in the compound if applicable. This field is optional.
• Chlorine (Cl): Enter the number of chlorine atoms. This field is optional.

Step 2: Calculation and Results

After filling in the appropriate fields with the number of atoms:

• Press the calculate button to compute the molecular weight and empirical formula of the compound.
• The calculator uses the precise atomic weights to provide the molecular weight. The formula used is:
  (hydrogen * 1.00794) + (carbon * 12.0107) + (nitrogen * 14.0067) + (oxygen * 15.9994) + (sulfur * 32.065) + (phosphorus * 30.973762) + (chlorine * 35.453).

Step 3: Viewing the Results

• Molecular Weight: The molecular weight of the compound will be displayed in grams per mole (g/mol) with four decimal places for precision.
• Empirical Formula: Based on the number of atoms entered, the empirical formula will be generated. For example, if you enter 2 hydrogen atoms and 1 oxygen atom, it will display H2O.

Using this step-by-step guide, you can accurately determine the molecular weight and empirical formula of any compound with the given elements.