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The moles calculation is a fundamental concept in chemistry that relates the mass of a substance to the amount of substance in moles. It uses the formula n = Mass / Mr, where n is the number of moles, Mass is the mass in grams, and Mr is the relative molecular mass in g/mol.
The calculator uses the moles formula:
Where:
Explanation: This formula allows you to calculate the amount of substance when you know the mass and the relative molecular mass of that substance.
Details: Understanding moles is essential for chemical calculations, including stoichiometry, concentration calculations, and reaction yields. It forms the basis for quantitative chemistry at GCSE level and beyond.
Tips: Enter the mass in grams and the relative molecular mass in g/mol. Both values must be positive numbers. The calculator will compute the number of moles.
Q1: What is a mole in chemistry?
A: A mole is the SI unit for amount of substance. One mole contains exactly 6.022 × 10²³ elementary entities (Avogadro's number).
Q2: How do I find the relative molecular mass?
A: Relative molecular mass (Mr) is the sum of the relative atomic masses of all atoms in a molecule. You can find these values on the periodic table.
Q3: Can this calculator be used for elements and compounds?
A: Yes, the formula works for both elements and compounds. For elements, use the relative atomic mass (Ar) instead of Mr.
Q4: What are common units for mass and Mr?
A: Mass is typically measured in grams (g) and relative molecular mass in grams per mole (g/mol) for these calculations.
Q5: Why is moles calculation important at GCSE level?
A: Moles calculations are fundamental to understanding chemical quantities, reaction stoichiometry, and are essential for many GCSE chemistry exam questions.