The percentage composition of carbon by mole in methane () is:

Question

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Strategy:
 "Percentage by mole" (or mole percent) refers to the ratio of the number of atoms of an element to the total number of atoms in the molecule, multiplied by 100. It is distinct from mass percentage.

Step 1: Count the atoms in one molecule of } \ce{CH4}
- Carbon atoms 
- Hydrogen atoms 
- Total atoms

Step 2: Calculate mole percentage of Carbon

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