Answer:
CH4 (Methane)
Explanation:
The compound is found to be composed of 75% carbon and 25% hydrogen.
100 g of the compound contains 75 g of carbon and 25 g of hydrogen.
The atomic masses of carbon and hydrogen are 12 g/mol and 1 g/mol respectively.
The number of moles of C =  12 g/mol  /75 g  = 6.25 moles
The number of moles of H =  1 g/mol  / 25 g  = 25 moles
The mole ratio C:H=6.25:25=1:4
The empirical formula of the compound is CH Â 4
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