Physical- Amount of Substance Flashcards
Define relative atomic mass
The average mass of an atom
Define a mole
The unit used to measure the amount of a substance
What is the equation for moles?
Moles = mass divided by
Mr
What is the equation for percentage yield?
actual yield x by 100
theoretical yield
What is the atom economy?
A measure of the amount of starting materials that become useful products
What is the equation for atom economy?
Mr of desired product x by 100
Mr of reactants of equation
What is the equation for concentration?
amount of solute in g
volume of solution in dm3
What is the empirical formula?
The simplest whole number ratio of atoms of each element in a compound
What is the molecular formula?
The true number of each atom in the molecule
What is the ideal gas equation?
PV=nRT
What are the ideal gas equation units?
P= pressure, measured in Pa
V= volume, measure in m3
n= number of moles
R= gas constant
T= temperature, measured in K
How do we find the temperature in kelvin (only if it is initially given in degrees)?
Number of degrees + 273= K
How do we find the pressure in Pa?
kPa x 10(3) = Pa
MPa x 10(6) = Pa
How do we find the volume in m(3)?
dm(3) x 10(-3) = m(3)
cm(3) x 10(-6) = m(3)
What equations do we use for solution calculations?
concentration= mass (g) divided by volume (dm3)
mass= moles x Mr
How to calculate percentage uncertainty?
uncertainty divided by value x100
How do you convert between dm cubed and metres cubed?
Divide by 1000 (thousand)
How can you increase the atom economy of a process?
Find A use/buyer of the other products
Define relative atomic mass
The average mass of an atom of an element divided by one twelfth of the mass of an atom of carbon-12
What formula links volume, concentration and moles?
Moles = concentration x volume
How do you convert between kPa and Pa?
Times by 1000 (thousand)
What is the atom economy of a process with only one product?
100 %
Define relative molecular mass
The average mass of a molecule divided by one twelfth of the mass of an atom of carbon-12
How do you convert between cm cubed and meters cubed?
Divide by 1000000 (million)
