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11 Dec 2019

Dinitrogen oxide (N2O), laughing gas, is used by dentists as an anesthetic. If a 20.0 L tank of laughing gas has a pressure of 2.64×103 mmHg, how many moles of N2O in the tank?

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13 Dec 2019
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Related questions


Laboratory gas cylinders have a volume of about 50 L. How mant grams of N2O would be there in a gas cylinder at 21.41 degrees C and a pressure of 19.81 atm if the volume of the tank was exactly at 50L? Assume ideal gas behavior.

I need a help with the follwoing questions:


1. A 0.987g sample of unknown required 34.77 mL of a 0.04955 MKMnO4 solution to reach an end point in the titration.

a) How many moles of KMnO4 were used?

b) How many moles of iron(II) were present in the unknown?

c) How many grams of iron(II) were present in the unknown?

d) What percentage of the unknown was iron(II)?


2.For the molecule N2O, commonly known as laughing gas, thereare five possible Lewis structures that satisfy the octet rule.Three have the N-N-O bond skeleton and two would have the N-O-Nskeleton.

a) Draw the five Lewis structures

b) By considering the formal charges, can you suggest whichstructures might be eliminated?

c) Which structures have the smallest formal charges?

d) Because oxygen is more electronegative than nitrogen, it ismore likely to have a more negative formal charge. Which structurewould be the best description of N2O?

e )Are the structures that have the N-O-N bond skeletonresonance forms of the structures with the N-N-O skeleton?Explain.


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