Home
Back
Moles to Grams Formula:
| From: | To: |
The moles to grams formula (g = n × MW) is a fundamental stoichiometric equation that converts between the amount of substance in moles and its corresponding mass in grams using the molar mass of the substance.
The calculator uses the simple formula:
Where:
Explanation: The formula directly relates the number of particles (moles) to mass through the substance's molar mass, which is the mass of one mole of that substance.
Details: Converting between moles and grams is essential for chemical reactions, solution preparation, and quantitative analysis in chemistry. It allows chemists to measure substances by mass while working with reaction ratios based on mole quantities.
Tips: Enter the amount of substance in moles and the molar mass in g/mol. Both values must be positive numbers. The molar mass can be found on the periodic table (sum of atomic masses for all atoms in the molecule).
Q1: Why is the mole concept important in chemistry?
A: Moles allow chemists to count particles by weighing them, since counting individual atoms/molecules is impractical. One mole contains Avogadro's number (6.022×10²³) of particles.
Q2: How do I find the molar mass of a compound?
A: Sum the atomic masses of all atoms in the molecule. For example, water (H₂O) has molar mass = (2×1.008) + 15.999 = 18.015 g/mol.
Q3: Can this calculator be used for any chemical substance?
A: Yes, as long as you know the correct molar mass of the substance, this calculation works for elements, compounds, or mixtures.
Q4: What's the difference between molecular weight and molar mass?
A: They are numerically identical but molecular weight is dimensionless while molar mass has units of g/mol. The terms are often used interchangeably.
Q5: How precise should my molar mass values be?
A: Use at least 2 decimal places for most work. For very precise calculations, use 4+ decimal places from IUPAC atomic weights.