What is kg-mole ? How many electrons are present in 1 kg mole of methane (`CH_4`)?

Explanation

**Step-by-Step Solution:**

1. **Understanding kg-mole:**
- A kg-mole (kilogram mole) is a unit of amount of substance. It refers to the quantity of a substance that has a mass equal to its molecular weight expressed in kilograms.
- For example, if the molecular mass of a substance is X g/mol, then 1 kg mole of that substance would weigh X kg.

2. **Determining the molecular mass of methane (CH₄):**
- The molecular mass of methane (CH₄) can be calculated by adding the atomic masses of its constituent atoms:
...