Question

An organic compound contain carbon 75% and 25% hydrogen by mass determine the empirical formula of compound

Answer 1

let carbon 75% = 75 gm = 75/12 = 6.25 mole×4 = 25/25 = 1


let hydrogen 25% = 25gm = 25/1 = 25 mole×4 = 100 /25 = 4

then , empirical formula = CH4

Answer 2

Answer:

ch4

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  

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= 6.25 moles

The number of moles of H =  

1 g/mol  

25 g  

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= 25 moles

The mole ratio C:H=6.25:25=1:4

The empirical formula of the compound is CH 4  

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