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Moles Formula:
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The number of moles formula calculates the amount of substance in a given sample. It is a fundamental concept in chemistry that relates the mass of a substance to its molar mass, allowing chemists to quantify chemical amounts at the molecular level.
The calculator uses the moles formula:
Where:
Explanation: The formula divides the mass of a substance by its molar mass to determine the number of moles, which represents the amount of substance in terms of Avogadro's number of particles (6.022 × 10²³).
Details: Moles calculation is essential for stoichiometric calculations in chemical reactions, determining reactant and product quantities, preparing solutions with specific concentrations, and understanding quantitative relationships in chemistry.
Tips: Enter the mass in grams and molar mass in g/mol. Both values must be positive numbers. The calculator will compute the number of moles with four decimal places precision.
Q1: What is a mole in chemistry?
A: A mole is the SI unit for amount of substance, defined as exactly 6.02214076 × 10²³ particles (atoms, molecules, ions, or other particles).
Q2: How do I find the molar mass of a compound?
A: Molar mass is calculated by summing the atomic masses of all atoms in the chemical formula. For example, water (H₂O) has molar mass of 2×1.008 + 16.00 = 18.016 g/mol.
Q3: Can this formula be used for gases?
A: While this formula works for gases, the ideal gas law (PV = nRT) is often more convenient for gaseous substances when pressure and volume are known.
Q4: What's the difference between mass and moles?
A: Mass measures the quantity of matter in grams, while moles measure the number of particles. Moles allow chemists to count atoms and molecules by weighing.
Q5: Why is Avogadro's number important?
A: Avogadro's number (6.022 × 10²³) provides the link between the atomic scale and macroscopic scale, allowing us to work with measurable quantities of substances while thinking about individual atoms and molecules.