Amount of Substance Flashcards
Name all three equations linking with moles
Moles = mass/relative atomic mass
Moles = concentration x volume
(In gases) moles = volume/24
What is a mole?
The amount of substance that contains 6.02 X 10^23 atoms
What is the equation for concentration?
N = c x v Moles = concentration x volume
Equation for gas moles?
Moles = volume/24
Equation for molar(mass)
Moles = mass/mr N = m/mr
Equation of pressure of a gas at room temperature
P V = NRT P = pressure(pascals, pa) V = volume(m^3) N = no. Of moles R = gas constant - 8.314 T = temperature(Kelvin)
What is molecular formula?
Number of atoms of each element in a molecule
What is empirical formula?
Simplest whole number ratio of atoms of each element in a compound
What is relative molecular mass?
The mass of a molecule in comparison to the mass of an atom of Carbon-12
What does the dot mean in between a salt and water?
Means that the salt has been hydrated
What is a standard solution.
A solution of known concentration
What is molar gas volume?
The volume per mole of gas molecules at standard room temperature and pressure
1 mole of gas = 24dm^3 or 24,000cm^3
How to work out percentage yield
Actual yield/theoretical yield x 100
How to work out atom economy
Sum of molar masses of desired products/sum of molar masses of all products x 100
