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Molar Mass Formula:
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Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It represents the mass of 6.022 × 10²³ particles (atoms, molecules, or formula units) of that substance.
The molar mass is calculated using the formula:
Where:
Explanation: Multiply the atomic mass of each element by the number of atoms of that element in the compound, then sum all these products.
Step 1: Identify all elements in the chemical formula
Step 2: Find the atomic mass of each element from the periodic table
Step 3: Count the number of atoms of each element
Step 4: Multiply atomic mass by atom count for each element
Step 5: Sum all the products to get total molar mass
Details: Molar mass is essential for converting between mass and moles in chemical calculations, determining empirical and molecular formulas, and calculating solution concentrations.
Q1: What's the difference between atomic mass and molar mass?
A: Atomic mass is the mass of one atom (usually in amu), while molar mass is the mass of one mole of atoms/molecules (in g/mol).
Q2: How do I find atomic masses?
A: Atomic masses are found on the periodic table. They represent weighted averages of naturally occurring isotopes.
Q3: What if a compound has parentheses in its formula?
A: Multiply everything inside parentheses by the subscript outside. For example, in Ca(OH)₂, there are 2 O and 2 H atoms.
Q4: Why are atomic masses not whole numbers?
A: Atomic masses are weighted averages of isotopes, accounting for different natural abundances of each isotope.
Q5: Can this calculator handle complex formulas?
A: This calculator handles basic chemical formulas. For complex formulas with parentheses or hydrates, manual calculation may be needed.