USNCO Exams Reference Page

Below is the standard information provided for reference in all USNCO exams. No additional information may be accessed while taking any USNCO exam.

Abbreviations and Symbols

Full NameAbbreviation/ Symbol
Amount Of SubstanceN
AmpereA
AtmosphereAtm
Atomic Mass UnitU
Avogadro ConstantNA
Celsius Temperature°C
Centi– PrefixC
CoulombC
DensityD
Electromotive ForceE
Energy Of ActivationEa
EnthalpyH
EntropyS
Equilibrium ConstantK
Faraday ConstantF
Free EnergyG
FrequencyΝ
Gas ConstantR
GramG
HourH
JouleJ
KelvinK
Kilo– PrefixK
LiterL
Measure Of PressureMm Hg
Milli– PrefixM
MolalM
MolarM
Molar MassM
MoleMol
Planck’s ConstantH
PressureP
Rate ConstantK
Reaction QuotientQ
SecondS
Speed Of LightC
Temperature, KT
TimeT
Vapor PressureVP
VoltV
VolumeV
YearY

Constants

R = 8.314 J mol–1 K–1
R = 0.08314 L bar mol–1 K–1
F = 96,500 C mol–1
F = 96,500 J V–1 mol–1
NA = 6.022 x 1023 mol–1
h = 6.626 x 10–34 J s
c = 2.998 x 108 m s–1
0 °C = 273.15 K
1 atm = 1.013 bar = 760 mm Hg
Specific heat capacity of H2O = 4.184 J g–1 K–1

Equations

E = Eo(RT/nF) x lnQ

lnK = (—ΔHo/R) x (1/T) + constant

ln(k2/k1) = (Ea/R) x ((1/T1) — (1/T2))

 

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