Getting The Most Out Of Reactants Flashcards
What is the m = n x GFM units?
m - mass in g
n - number of moles in mol
GFM - gram formula mass
What is the n = c x v units?
n = number of moles in mol c = concentration in moll^-1 (mol per litre) v = volume in litres
How to covert cm^3 to litres?
Divide by 1000 or 10^3
How to covert kg to g?
multiply by 1000
What is the molar volume of gas?
One mole of any gas (at the same temperature and pressure) occupies the same volume.
How do you calculate the mass of a gas?
Step 1: weigh the gas in a plastic container under pressure using a balance
Step 2: use a gas syringe to measure the volume of gas
Step 3: re weigh the plastic container with the gas and calculate the difference.
How is excess calculated in gas?
Using litres
How do you calculate the limiting reactant and excess?
- Take the two reactants and calculate the number of moles for each one.
- Take into account the other moles
- Take the number of moles away from the other reactants moles
- Whichever one has a positive number at the end is in excess and the one with the negative number is the limiting reactant
- In order to work out the products moles, take the limiting reactants moles.
What is the actual quantity in percentage yield?
Actual yield is the value you are given in the question
What is the theoretical yield in percentage yield?
Theoretical yield is what you expect to obtain by calculation assuming 100% conversion of reactants into products.
Atom economy?
Multiply by the number of moles for both desired produces and reactants
What is the difference between mean bond enthalpy and bond enthalpies?
Bond enthalpy is the energy required to break a special bond.
Mean bond enthalpy is the average energy required to break a bond from a different environment.
