What is the formula for percentage yield
Percentage yield =actual yield / theoretical yield x 100
What might make your yield lower than expected
1)The reaction is reversible
2) Product is lost when it is separated from the reactants
3) Unexpected reactants
What is the formula for atom economy
Atom economy = total Mr of the desired product /total Mr of all the reactants x100
What is atom economy
Atom economy measures how much of the atoms in the reactants end up in the desired product (tells u how wasteful reaction is )
What is percentage yield
The percentage yield is the comparison between the amount of product you expect to get and the amount of product u actually get
What is the formula for concentration
Concentration = mass / volume
How do u get from cm3 to dm3
Divide by 1000
What are the units of concentration for a solute
G/dm3
What is moles
6.02x 10 23
Avogadro’s constant
What is the formula for moles
Remember Mr mole lives under a mass
Mass= Mr x number of moles
What is the formula for percentage mass
Percentage mass =Ar / Mr x 100
Why might the mass increase in a reaction with a gas
The molecules of the reactants have combined
Why might in a reaction with gases the mass decrease
The gases has left the reaction mixture
What is uncertainty on a digital instrument
+- half the resolution
What is the uncertainty for an instrument with a scale
The uncertainty is equal to the resolution
How do u calculate the concentration in a solution
Concentration (mol/dm3) = amount of solute (mol) / volume of solution (dm3)
What do u need to calculate the volume of the gas
1) mass of gas
2) the relative formula mass of gas
What is the formula for the volume of a gas
Volume at room temp and pressure (dm3) =mass (g) / Mr of gas x 24 dm3
