A sample of ethane has the same mass as 10.0 million molecules of methane. How many `C_2H_6` molecules does the sample contain?

Explanation

To solve the problem, we need to find out how many molecules of ethane (C₂H₆) are present in a sample that has the same mass as 10 million molecules of methane (CH₄).

### Step-by-Step Solution:

1. **Determine the molecular weight of methane (CH₄)**:
- The molecular weight of methane (CH₄) is calculated as follows:
- Carbon (C) = 12 g/mol
- Hydrogen (H) = 1 g/mol
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