REPORT SHEET
Date 10/29/2018 Name LanAnh Nguyen,
Atmospheric Pressure Partner Sabrina Terrell, Takhari
Worthy-Hall
Include with this report sheet the data sheet and all calculations. Be sure everything is complete.
1. The weather stations give the atmospheric pressure in inches of Hg. What is your
measured atmospheric pressure in inches Hg? You may need to consult your textbook
for a proper conversion factor. (Show all of your work clearly.)
The total atmosphere pressure was 577.6 mmHg
0.0254∈¿
1m=0.0147 inHg
577.6 mmHg
1×1m
1000 mm ׿
2. Since the pressure could also be a measured physical quantity, as are the volume and
temperature, could the Ideal Gas Law be used to solve for the number of moles of a
gas? (HINT: Yes!) You need to rearrange the equation to solve for moles in terms of
the other variables. (You need not determine a numerical answer, just write the correct
algebraic equation.)
PV =nRT
=>
n=PV
RT
3. If the amount of gas (in grams) is known, the molecular weight of a gas can be
determined. (Recall how molecular weights are needed for determining molecular
formulas knowing empirical formulas.) You have 15 grams of a gaseous unknown
substance. If the substance has a volume of 11.2 liters at a pressure of 1 atmosphere and a
temperature of 0º C, determine the molecular weight of this unknown substance. (HINT:
You will need the equation from #2 above and the units of molecular weight. Use
n=PV
RT =1atm ∙11.2 L
0.0821 atm∙ L
mol ∙ K ∙273.15 K
=0.499 mol
Molecular Mass:
MW =mass
mol =15 g
0.499 =30 g/mol