The mass of one mole of a substance in grams is called its …A… Here, A refers to — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

I notice the question references "Correct answer: B" but doesn't provide the answer options (A, B, C, D, etc.). However, based on the question stem, I can provide the solution: **The mass of one mole of a substance in grams is called its *molar mass* (or *molecular weight*).** **Step-by-step explanation:** 1. **Definition of mole**: One mole contains Avogadro's number ($6.022 \times 10^{23}$) of particles. 2. **Molar mass relationship**: If a substance has a molar mass of $M$ g/mol, then 1 mole of that substance has a mass of $M$ grams. 3. **Example**: - Carbon-12 has an atomic mass of 12 u - Therefore, one mole of C-12 atoms has a mass of 12 g - This mass (12 g) is the **molar mass** of carbon 4. **General formula**: $$\text{Molar mass} = \frac{\text{Mass (in grams)}}{\text{Number of moles}}$$ Without seeing the options, the answer is **molar mass** or **molecular weight**. If option B corresponds to this term, that would be the correct answer.