Quantative Chemistry Flashcards
What is Relative Formular Mass (Mr)?
sum of relative atomic masses of each atom in compound
What is Relative Atomic Mass (Ar)?
average of isotopses of an element’s protons and neutrons
How do you calculate Mr?
find the AR of each element and add them up -> find Mr of compound
How much is 1 mole worth?
6.02 x 10^23
What is the number of atoms in 1 mole called?
Avogadro’s constant
How much is 1 mole of an atom in 1 mole of a particular element?
however many atoms that element has
What is the equation to caculate moles?
moles = mass/Mr
What is the equation for percentage yield?
actual yield/theoretical yield x 100
What 3 reasons explain why chemical reactions might not have a yield of 100%?
- some products may be left in apparatus
- reaction may not be completely finished
- some reactants may give unexpected products
What is the equation for percentage atom economy?
Mr of useful product/Mr of total products
x 100
What is the equation for concentration?
conc. = mol/volume
Define molar volume.
volume occupied by any 1 mole of gas at particular temp & pressure
At room temp. and 1 ATM pressure, what is the molar volume of gas?
24dm^3
What is the equation for moles, of a gas?
mol = volume of gas/24dm^3
