如何计算Molar Mass

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Molar mass is the mass of one mole (6.022 × 10²³ particles) of a substance, expressed in grams per mole (g/mol). It equals the sum of the atomic masses of all atoms in the molecular formula. Molar mass is essential for stoichiometry — calculating how much of each substance reacts or is produced in a chemical reaction.

公式

Molar mass = sum of (atomic mass × count) for each element

分步指南

1Molar mass = sum of (atomic mass × count) for each element
2Atomic masses are from the IUPAC periodic table (in amu = g/mol)
3H₂O: 2 × 1.008 + 16.00 = 18.016 g/mol
4Avogadro's number: 1 mole = 6.022 × 10²³ molecules
5n = m / M: moles = mass (g) / molar mass (g/mol)

例题解析

输入

H₂O (water)

结果

18.02 g/mol

2H(1.008) + O(15.999) = 18.015

输入

NaCl (table salt)

结果

58.44 g/mol

Na(22.99) + Cl(35.45) = 58.44

输入

C₆H₁₂O₆ (glucose)

结果

180.16 g/mol

6×12.011 + 12×1.008 + 6×15.999

常见问题

What is Molar Mass Calc?

Molar mass is the mass of one mole (6. 022 × 10²³ particles) of a substance, expressed in grams per mole (g/mol)

How accurate is the Molar Mass Calc calculator?

The calculator uses the standard published formula for molar mass calc. Results are accurate to the precision of the inputs you provide. For financial, medical, or legal decisions, always verify with a qualified professional.

What units does the Molar Mass Calc calculator use?

This calculator works with inches. You can enter values in the units shown — the calculator handles all conversions internally.

What formula does the Molar Mass Calc calculator use?

The core formula is: Molar mass = sum of (atomic mass × count) for each element. Each step in the calculation is shown so you can verify the result manually.

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