Chemistry, 25.02.2021 20:50 mihirkantighosh

It’s your first day on the job, working as an analytical chemist for Exxon-Mobil! The lead petroleum engineer comes to you, saying that they had an unexpected layer in their fractional distillation and would like you to investigate the compound. They give you a purified, 100g sample of this unknown hydrocarbon (CxHy) to analyze to determine the chemical makeup. You decide that you should burn (combust!) the mystery compound to determine its chemical formula through quantitative analysis. After using enough oxygen to completely combust the entire sample, you measure the resulting products.

Doing so yields 343.356 g of a colorless, relatively inert gas and 56.22 g of a clear gas which quickly condenses to a liquid at room temperature. You also determine the molar mass of the compound to be 128.17 g/mol.

Please list the steps you would use to solve the problem, and give your boss a molecular formula of the unknown compound.

Some tips:
Review what a combustion reaction is! What are the products?
Identify what the two products are! Can you calculate their molar masses?
Make sure to compare ratios of the elements themselves!
Once you have the empirical formula, how can you find out the molecular formula?

Answers: 2

Show answers

Another question on Chemistry

Chemistry, 21.06.2019 21:00

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

Answers: 1

Answer

Chemistry, 21.06.2019 23:20

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night. when he took it out, its new volume was 322 milliliters, but its pressure was the same. if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is kelvins.

Answers: 2

Answer

Chemistry, 22.06.2019 08:30

7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation. 8. when a 2.5 mol of sugar (c12h22o11) are added to a certain amount of water the boiling point is raised by 1 celsius degree. if 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? show all calculations leading to your answer or use 3 – 4 sentences to explain your answer. 9. if 5.40 kcal of heat is added to 1.00 kg of water at 100⁰c, how much steam at 100⁰c is produced? show all calculations leading to an answer. 10. the freezing of water at 0⁰c can be represented as follows: h2o (l) ↔ h2o(s) the density of liquid water is 1.00 g/cm3. the density of ice is 0.92 g/cm3. in 3 – 4 sentences explain why applying pressure causes ice to melt.

Answers: 1

Answer

Chemistry, 22.06.2019 11:00

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

Answers: 1

Answer

You know the right answer?

It’s your first day on the job, working as an analytical chemist for Exxon-Mobil! The lead petroleum...

Questions