68 338
Assignments Done
98,8%
Successfully Done
In November 2018

Answer to Question #56131 in General Chemistry for Erica Wilson

Question #56131
An unknown compound contains only C, H, and O. Combustion of 4.00g of this compound produced 9.42 g of CO2 and 2.57 g of H2O. What is the empirical formula of the unknown compound.
Expert's answer
1) Determine the grams of carbon in 9.42 g CO2 and the grams of hydrogen in 2.57 g H2O.
carbon: 9.42 g x (12.011 g / 44.0098 g) = 2.571 g
hydrogen: 2.57 g x (2.0158 g / 18.0152 g) = 0.288 g
2) Convert grams of C and H to their respective amount of moles.
carbon: 2.571 g / 12.011 g/mol = 0.214 mol
hydrogen: 0.288 g / 1.0079 g/mol = 0.286 mol
3) Divide each molar amount by the lowest value, seeking to modify the above molar amounts into small, whole numbers.
carbon: 0.214 mol / 0.214 mol = 1
hydrogen: 0.286 mol / 0.214 mol = 2.9986 = 1.333
4) Multiply these values till obtain the whole numbers: 1x3 = 3; 1.333x3 = 4
We have now arrived at the answer: the empirical formula of the substance is C3H4
Answer: C3H4

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be first!

Leave a comment

Ask Your question

Submit
Privacy policy Terms and Conditions