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13 Dec 2019

This lab will require you to determine the number of moles of carbon dioxide in a flask. This will require you to know the volume of the flask, the temperature of the gas inside it, and the pressure of the gas. Give a one-to two sentence explanation of how each of these things will be determined.

(a) Assume for the moment that air consist of 80.00% nitrogen and 20.00% oxygen by volume. Use these figures and typical values for temperature and pressure (1.000 atm, 25.0 ºC) to calculate the density of air.

(b) This calculation affords a good approximation of the density of air at sea level. However, your lab is at an altitude approximately 777 meters (2550 feet). Knowing this, will the density of air in you lab be higher or lower than the value you just calculated? Why?

(c) Besides altitude, what else affects the atmospheric pressure? Where could you find the actual atmospheric pressure at the time of the experiment?

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Keith Leannon
Keith LeannonLv2
17 Dec 2019

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Related questions

pre lab question:

1. Assume for the moment that air consists of 80.00% nitrogen (N2) and 20.00% oxygen (O2) by volume. Use these figures and typical values for temperature and pressure (1.000 atm and 25.00°C) to calculate the density of air in g/L.

2. Explain how you will determine the mass of CO2 gas in your flask.

3. This experiment will require you to know the volume of the air/gas present in your flask. How will you measure this volume?

4. If you are use a graduated cylinder with markings in increments of 0.2 mL to measure liquids, you should interpolate and record volume readings to the nearest what?

Question 21 pts

In Vinegar Analysis lab, at the end point of a titration, there is still a drop of NaOH solution hanging on the tip of burrette. How does this affect the experimental result in this lab?

Since this drop did not have a chance to react with acetic acid, it should not affect the experimental result.
Since this drop of NaOH did not have a chance to react with acetic acid in vinegar, it will make the experimental result lower.
Since this drop will make the volume of NaOH artificially higher, it will make the experimental result higher as well.

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Question 41 ptsSkip to question text.

At constant pressure, density of gas is inversely proportional to its temperature. This is how hot air balloon is floating in air: burning fuel makes inside air temperature higher and density lower; low density air balloon float on high density regular air. What is the density of air in g/L at 76 degree C if the atmospheric pressure is 1.0 atm? The average molar mass of air is about 29 g/mol. Keep two decimal places for your answer.

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