Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mol). It's calculated by summing the atomic masses of all the atoms in the chemical formula. Understanding molar mass is crucial for converting between mass and moles, which is fundamental in stoichiometry and chemical reactions. Let's test your skills with these practice problems!
Match each term with its correct definition:
| Term | Definition |
|---|---|
| 1. Mole | A. The smallest unit of a substance that retains its chemical properties. |
| 2. Molar Mass | B. The number of atoms in exactly 12 grams of carbon-12. |
| 3. Atomic Mass | C. The mass of one mole of a substance, usually expressed in grams per mole (g/mol). |
| 4. Avogadro's Number | D. 6.022 x 1023, representing the number of entities in a mole. |
| 5. Molecule | E. The amount of substance containing the same number of particles as there are atoms in 12 g of carbon-12. |
The molar mass of a compound is found by adding the _______ _______ of each element in the chemical formula. This value is typically expressed in units of _______ per _______. To convert grams to moles, you _______ the mass by the molar mass. Avogadro's number is approximately _______ and represents the number of _______ in one mole.
Explain how knowing the molar mass of a substance helps in performing chemical reactions. Provide a specific example.
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