The mass of one mole of a substance in grams is called its ….A ……. Here A refers to

Options

A. Avogadro mass
B. molar mass
C. atomic mass
D. formula mass

Answer

To solve the question, "The mass of one mole of a substance in grams is called its ….A ……. Here A refers to", we need to identify the term that describes the mass of one mole of a substance.

### Step-by-Step Solution:

1. **Understanding the Concept**:
- The question states that we are looking for a term that describes the mass of one mole of a substance measured in grams.

2. **Defining Molar Mass**:
- The term that describes the mass of one mole of a substance is known as "molar mass". Molar mass is defined as the mass of one mole of a substance (in grams) and is usually expressed in grams per mole (g/mol).

3. **Example for Clarity**:
- For instance, if we take sodium (Na), its molar mass is approximately 23 grams per mole. This means that one mole of sodium weighs 23 grams.

4. **Conclusion**:
- Therefore, the answer to the question is that the mass of one mole of a substance in grams is called its **molar mass**.

5. **Identifying A**:
- In this context, A refers to **molar mass**.

### Final Answer:
The mass of one mole of a substance in grams is called its **molar mass**. Here, A refers to **molar mass**.

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