please help me.. I want to know how to get the answer The percent composition of

Question

please help me.. I want to know how to get the answer The percent composition of a hydrcarbon is found to be 92.3%carbon and 7.7% hydrogen. a) What is the emirical formula of the compound? b) Its molar mass is 78g/mol. What is the molecular formula ofthe compound? please help me.. I want to know how to get the answer The percent composition of a hydrcarbon is found to be 92.3%carbon and 7.7% hydrogen. a) What is the emirical formula of the compound? b) Its molar mass is 78g/mol. What is the molecular formula ofthe compound?

Explanation / Answer

                           C                    H                           92.3%              7.7% Divide each number with the respective atomicweight                           92.3/12             7.7 / 1                                                      7.69                     7.7 divide with the least number                            7.69 /7.69          7.7 / 7.69                          =1                         1     emperical formula of the compoundis CH        molecular formula =   (CH)n       where,    n = molecular formula weight / emperical formula weight                         = (78 / 13)                         = 6    molecular formula of the compoundis C6H6      

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