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K =
C + 273.15
Barometric pressure units
mmHg
mL —> L
/1000
Vapor pressure of water (mmHg)
Found from barometric pressure
Ex. Pressure of dry CO2
barometric pressure mmHg - vapor pressure of water mmHg
x (1 atm / 760 mmHg)
final units = atm
R =
0.0821 atm x L / mol x K
Moles =
(PV)/(RT)
Ex. Grams of NaHCO3 in ¼ tablet
Moles of CO2 —> grams of NaHCO3
moles of CO2 x stoichimetric relationship (1:1)
x molar mass of NaHCO3
Ex. mass % of NaHCO3 in ¼ tablet
grams of NaHCO3 in ¼ tablet / mass of ¼ tablet (taken initially)
Theoretical mass %
Given to you
% error
theoretical mass % - mass % / theoretical mass % x 100
Ideal gas law
PV = nRT