Math Problem Statement
How do I calculate molar mass?
Solution
To calculate the molar mass of a substance, you need to sum the atomic masses of all the atoms in its chemical formula. Here’s the step-by-step process:
Steps:
- Write the chemical formula of the compound.
- Determine the atomic mass of each element in the compound from the periodic table. These are usually given in atomic mass units (amu).
- Multiply the atomic mass of each element by the number of atoms of that element in the compound.
- Add the results together to get the total molar mass, expressed in grams per mole (g/mol).
Example: Calculate the molar mass of H₂O (water)
- Chemical formula: H₂O
- Atomic masses (from the periodic table):
- Hydrogen (H) ≈ 1.01 g/mol
- Oxygen (O) ≈ 16.00 g/mol
- Multiply by the number of atoms:
- For H: 1.01 g/mol × 2 = 2.02 g/mol
- For O: 16.00 g/mol × 1 = 16.00 g/mol
- Add them:
- Total molar mass of H₂O = 2.02 g/mol + 16.00 g/mol = 18.02 g/mol
So, the molar mass of water (H₂O) is 18.02 g/mol.
Would you like further details or have any questions?
Here are some related questions to expand your understanding:
- How is molar mass used in stoichiometry?
- What is the difference between molar mass and molecular mass?
- How would you calculate the molar mass of a compound with a polyatomic ion?
- How does the molar mass of isotopes differ from the average atomic mass?
- How can molar mass help in converting between grams and moles?
Tip: Always ensure to account for all atoms in the chemical formula when calculating molar mass!
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Math Problem Analysis
Mathematical Concepts
Stoichiometry
Atomic Mass
Molar Mass
Formulas
Molar mass = Sum of (atomic mass of element × number of atoms in the chemical formula)
Theorems
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Suitable Grade Level
Grades 9-12