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Moles Calculation Formula:
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Moles calculation is a fundamental concept in chemistry that determines the amount of substance present. It relates the mass of a substance to its molar mass, providing a way to quantify the number of particles (atoms, molecules) in a given sample.
The calculator uses the moles formula:
Where:
Explanation: The formula converts mass to moles by dividing by the molar mass of the substance. For silicon with atomic mass 28.09 g/mol and mass 4.68 mg (0.00468 g), the calculation is: \( n = \frac{0.00468}{28.09} \approx 0.000167 \) mol.
Details: Moles calculation is essential for stoichiometric calculations in chemical reactions, determining reactant quantities, product yields, and understanding quantitative relationships in chemistry.
Tips: Enter mass in milligrams and atomic mass in g/mol. The calculator automatically converts mg to g before calculation. Ensure values are positive and valid.
Q1: Why convert mg to g in the calculation?
A: Molar mass is typically expressed in g/mol, so mass must be in grams for consistent units in the formula n = m/M.
Q2: What is the atomic mass of silicon?
A: The atomic mass of silicon is approximately 28.09 g/mol, which is the average mass of silicon atoms accounting for natural isotopes.
Q3: How many atoms are in 0.000167 mol of silicon?
A: Using Avogadro's number (6.022 × 10²³ atoms/mol): 0.000167 × 6.022e23 ≈ 1.006 × 10²⁰ atoms.
Q4: Can this calculator be used for compounds?
A: Yes, but use molecular mass instead of atomic mass. For compounds, M represents the sum of atomic masses of all atoms in the molecule.
Q5: What is the significance of moles in chemistry?
A: Moles provide a bridge between the microscopic world (atoms, molecules) and macroscopic measurements (mass, volume), enabling quantitative chemical calculations.