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
Chemistry, 22.06.2019 14:00
What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?
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Chemistry, 22.06.2019 17:10
)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.
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Chemistry, 22.06.2019 19:10
Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .
Answers: 2
It’s your first day on the job, working as an analytical chemist for Exxon-Mobil! The lead petroleum...
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