The difference between 3CH4 and C3H12 is that the number of atoms of each element in each compound is different.
In chemistry, a compound is composed of a number of elements that are chemically joined together. Both 3CH4 and C3H12 are compounds.
The difference between 3CH4 and C3H12 is that the number of atoms of each element in each compound is different. The two are different compounds with different properties.
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