What is the main source of error in the determination of the molar mass?
What is the main source of error in the determination of the molar mass?
The primary source of error is in the mass measurement, which had a standard deviation of 1.5%. The method could be improved by using a more precise balance to decrease the error in the mass measurements. It is also interesting to note that the molar mass was found to be slightly smaller than the literature value.
How would the molecular weight for a volatile liquid be affected if the balance you did your weighing on had an error of 2.3 g choose the best answer?
If the weight has an error of 2.3 g, the resulting mass of volatile liquid will be less than its actual mass.
How do you find the molar mass of a volatile liquid?
Knowing the mass and the number of moles will allow us to compute the molar mass of the liquid: molar mass = (mass)/(number of moles).
How will the molar mass be affected higher or lower if you did not heat the flask long enough to vaporize all the gas explain?
(a) You did not completely vaporize the liquid when you heated it. When not completely vaporized then pressure value was less than actual. As a result, the value of n would be less. Molar mass value would be incorrectly high.
What is the molar mass of methane?
16.04 g/mol
Methane/Molar mass
What is the purpose of putting a small hole in the aluminum foil on top of the flask in this experiment choose all answers that apply?
Why must a very small hole be punctured in the aluminium foil? allow the excess vapour to escape from the flask.
How is volatility of a liquid calculated?
Scientists commonly use the boiling point of a liquid as the measure of volatility.
- Volatile liquids have low boiling points.
- A liquid with a low boiling point will begin to boil faster than liquids with higher boiling points.
What happens to the volatile liquid that is placed in the flask?
The flask is heated in boiling water. The liquid vaporizes, the vapors fill the flask and excess vapor leaves through the hole. Since the flask is open to the air, the pressure of the vapor will be the same as the atmospheric pressure. The gas temperature will be that of the boiling water.
How to determine the molar mass of an unknown volatile liquid?
Introduction: The molar mass of an unknown volatile liquid can be determined by placing an excess amount of the liquid in a pre-weighed flask and heating it up in a water bath. As the liquid evaporates, its vapor replaces the air in the flask, expelling the air and excess vapor through a pinhole at the top.
What is the purpose of the molar mass lab?
In this lab, the purpose is to evaporate an unknown liquid substance sample, and measure its physical properties while it condenses. By doing this, we will be able to tell what the molar mass of the liquid is.
What is the molar mass of the liquid in the test tube?
We then used the mass of the water in the test tube, as well as the density of water to find the volume of the test tube. By completing this lab, we can tell that the molar mass of our liquid is 717.84 g/mol.
Is the unknown volatile liquid flammable?
The unknown volatile liquid is an extremely flammable liquid and vapor. No open flames are allowed in the lab during the lab period! Vapors may cause flash fire, harmful if inhaled and fatal if the liquid is swallowed.
