Hello! Could anyone help me?:)

Write a formula of hydrocarbon, if you know that there is 92.3% of C and 7.7 of H. Also you know, that 1litre of this hydrocarbon (at under normal conditions) weighs 1.16g. Give me some help, please:)

Question

Hello! Could anyone help  me?:)

Write a formula of hydrocarbon, if you know that there is  92.3% of C and 7.7 of H. Also you know, that 1litre of this hydrocarbon (at under normal conditions) weighs 1.16g. Give me some help, please:)

kamille · Answer

And sorry for my poor English!

anonymous · Answer

find the empirical formula by dividing the percents by the molar masses of the individual elements first.  92.3/12.01 = X    7.7/1.008= Y

kamille · Answer

Thanks:)

anonymous · Answer

then divide the quotient that you get from that X and Y by the lesser of the two. ex. 7.686/ 7.63 and 7.63/7.63   Both quotients = 1. therefor your empirical formula is CH. from here you will find the molecular formula.

kamille · Answer

How can I find molecural formula? i still don't get it :\

anonymous · Answer

if the empirical formula is CH, then something is off. for hydrocarbons full saturation is noted by the formula $$C_nH_2n+2$$ where n = the number of carbon atoms. the least saturated of hydrocarbons are the alkynes $$C_n H_2n-2$$ C ,H enough for the empirical of CH to not make sense.

anonymous · Answer

err last line should be C<H