Amount of Substance Flashcards
Define relative atomic mass
The average mass of one atom compared to one twelfth of the mass of one atom of carbon-12
State the equation for the number of moles
Mass/Mr
State the ideal gas equation and the units for each variable
PV=nRT
P= Pa, V= m3, R= 8.31, T= K
State the equation for concentration
Moles/Volume
How do you convert from ⁰C to K?
+ 273
How do you convert from cm3 to m3?
÷ 1,000,000
How do you convert from cm3 to dm3?
÷ 1,000
How do you convert from dm3 to m3?
÷ 1,000
What’s the equation for the number of particles in a substance?
No of particles = amount of substance (in mol) X Avogadro’s constant
What is Avogadro’s number?
6.02 x 10 (to the power of) 23
State the equation for density
Mass/volume
Define empirical formula
Simplest ratio of atoms of each element in the compound
Define molecular formula
The actual number of atoms of each element in the compound
State the equation percentage yield
Actual yield/theoretical yield x 100
State the equation for percentage atom economy
Mass of useful products/mass of all reactants x 100