A 0.562-g sample of Alka-Seltzer was analyzed, following the procedure given for

Question

A 0.562-g sample of Alka-Seltzer was analyzed, following the procedure given for this
experiment. 35.25 mL of gas was collected in the buret at a temperature of 22
Celcius and
atmospheric pressure of 29.93 inches of Hg. The vapor pressure of water at this
temperature is 19.8 torr.
What is the total volume of CO2 generated in this experiment? ___
Calculate atmospheric pressure in torr.
What is the partial pressure of CO2?

Use the ideal gas law equation, PV = nRT to calculate the moles of CO2 gas that was generated from this sample.

Explanation / Answer

PV=nRT

Ptotal=Pgas+PH2O= 29.93inches Hg= 1 atm = Pgas+ 0.0260 atm (or 19.8torr)

Pgas= 0.9739 atm

V= 35.25mL = 0.03525 L

R= 0.082 L atm perK per mol

T = 22oC = 295K

so, n = PV/RT= 1.419E-3 = taken mass/molar mass

taken mass= 1.419E-3 * 44 = 0.0624 g

so volume generated = mass/density = 0.0624g /0.001977 g/mL = 31.59 mL

Partial presuure Pgas = 0.9739 atm = 74.0164 torr

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