EXPERIMENT 13 POSTLABORATORY Ideal Gas Law Determination of

EXPERIMENT 13: POST-LABORATORY Ideal Gas Law: Determination of the Molar Mass of a Volatile Compound Name Section: Post-Laboratory Questions and Exercises DUE AFTER COMPLETING LAB. ANSWER IN SPACE PROVIDED. If the outside of the flask is not dried after vaporizing the liquid, will the unknown\'s calculated molecular weight be too high or too low? Explain. l. Assume the atmospheric pressure is I atm but the actual pressure is higher than 1 atm. How will this error affect the calculated molar mass of the unknown? Explain. If the vapor\'s volume were to be incorrectly recorded as 125 mL, how will this error affect the calculated molar mass of the unknown? Explain. 3. 4. Compare the rates of effusion of NH, and O Calculate the number of moles of Krypton gas contained in a 5.00 L container at 6.00 atm and 25.0 °C. If the gas is Argon instead of Krypton, will the answer change? Explain. 5. CHEM 1411 Experiment 13 Ideal Gas Law: Determination of the Molar Mas of a Volatile Compound 157

Solution

1.Answer:

The molecular weight be too high.

Explanation:

If it is not dried carefully, the molecular weight would be high because of water hanging outside of the flask.It means that the weight of the contained vapor is adhering with water. So the weight of vapor will be heavy and therefore the unknown compound mass will be too high