Question

Cryolite, Na 3AlF6
, is an important industrial reagent. It is made by the reaction below.
Al2O3
bsg  6NaOHbaqg 12HFbgg  2 Na 3AlF6
bsg  9H2Obg
In an experiment, 7 81 2 3
. g Al O and excess HFbgg were dissolved in 3.50 L of 0.141 M NaOH. If 28.2 g Na 3AlF6
was
obtained, then what is the percent yield for this experiment?

Answer 1

Answer:

Gas Pressure  Pressure – the force exerted on a given area P = F/A o Directly proportional to force and inversely proportional to area o The SI unit is the pascal (Pa); 1 Pa = 1 N/m 2 o 1 kPa = 1000 Pa; 1 bar = 100,000 Pa o In the U.S., pressure is measured in pounds per square inch (psi) o Atmosphere (atm) – originally represented the average sea level air pressure at the approximate latitude of Paris (45 degrees) o 101.3 atm = 101,325 Pa = 760 mm Hg = 760 torr = 14.7 psi o Barometer –the atmosphere exerts pressure on the liquid outside the test tube  the column of liquid exerts pressure inside the tube  t