Organic Chemistry Calculations, Ideal Gas & Boiling Point – Chemistry
The key terms of this chapter include Boiling Point, Temperature, Ideal Gas.
For many purposes we can treat butane (C4H10 ) as an ideal gas at temperatures above its boiling point of −1.°C
Suppose the pressure on a 800.mL sample of butane gas at 44.0 °C is tripled.
Answer
A sample of an unknown compound is vaporized at 200.°C . The gas produced has a volume of 960.mL at a pressure of 1.00atm, and it weighs 0.841g.
Assuming the gas behaves as an ideal gas under these conditions, calculate the molar mass of the compound. Round your answer to 3 significant digits.
Answer
The molar mass of the unknown compound is 34.0 g/mol.
Combustion of hydrocarbons such as heptane (C7H16) produces carbon dioxide, a “greenhouse gas.” Greenhouse gases in the Earth’s atmosphere can trap the Sun’s heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.
Answer
| Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right). This makes it easy to isolate and measure the amount of gas produced. Suppose the CO gas evolved by a certain chemical reaction taking place at 50.0 °C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 92.0 mL. |
 Sketch of a gas-collection apparatus |
Calculate the mass of CO that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about the reaction conditions and the nature of the gases.
Answer
0.085 g
Ideal Gas & Boiling Point – Organic Chemistry Quiz
Here is a graph of the probability of an atom moving with a particular speed, for a sample of xenon gas at −143.°C.
Use this graph to answer the following questions. Round each of your answers to the nearest m/s..
Note: your answers must be within 25 m/s of the exact answers to be graded correct.
Answer
A gas made up of atoms escapes through a pinhole 1.81 times as fast as Xe gas. Write the chemical formula of the gas.
Answer
Ar
For many purposes we can treat butane (C4H10 ) as an ideal gas at temperatures above its boiling point of −1.°C
Suppose the pressure on a 800.mL sample of butane gas at 44.0 °C is tripled.
Answer
A sample of an unknown compound is vaporized at 200.°C . The gas produced has a volume of 960.mL at a pressure of 1.00atm, and it weighs 0.841g.
Assuming the gas behaves as an ideal gas under these conditions, calculate the molar mass of the compound. Round your answer to 3 significant digits.
Answer
The molar mass of the unknown compound is 34.0 g/mol.
Ideal Gas & Boiling Point – Organic Chemistry Quiz
Combustion of hydrocarbons such as heptane (C7H16) produces carbon dioxide, a “greenhouse gas.” Greenhouse gases in the Earth’s atmosphere can trap the Sun’s heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.
Answer
Calculate the mass of CO that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about the reaction conditions and the nature of the gases.
Answer
0.085 g
Here is a graph of the probability of an atom moving with a particular speed, for a sample of xenon gas at −143.°C.
Use this graph to answer the following questions. Round each of your answers to the nearest m/s..
Note: your answers must be within 25 m/s of the exact answers to be graded correct.
Answer
A gas made up of atoms escapes through a pinhole 1.81 times as fast as Xe gas. Write the chemical formula of the gas.
Answer
Ar