A reaction of #53.1 "g"# of #"Na"# and #35.7 "g"# of #"Br"_2# yields #40 "g"# of #"NaBr"#. What is the percentage yield?
In order to work out the percentage yield of a reaction, we must use the following formula:
Now we must work out the theoretical yield of
We start by writing a balanced equation for the reaction
As we can see, the molar ratio of
Now that we have the balanced equation, we must work out how many moles we have of any reagent (in this case, sodium).
Moles can be worked out using this formula:
Now that we have the moles of sodium, we can work out the moles of sodium bromide. Since the molar ratio is
We have the moles and the atomic mass of
Finally, we can work out the percentage yield