ERROR1 an experiment has been performed below. what can be the sources of error in this experiment and how can you devel

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ERROR1
an experiment has been performed below. what can be the sources
of error in this experiment and how can you develop the experiment
to get a better yield, for example. The yield is written below.
Reaction 1: radical reaction= 40 mmol
Flowchart 1 radical reaction
Place 7,2g of N-bromosuccinimide and 4,3 ml of toluene
in a 100ml round bottomed flask and a few boiling
stones.
⇩
add 0,4g of benzoyl peroxide
⇩
add with pipette 50 ml of toluene and wash the solids
that have stuck to the
sides of the flask
⇩
set up the reflux device, and heat upp the solution (1h)
and swirl the solution every 5
min. ( toluene boils at 110,6 degrees)
⇩
take the round bottom flask and put it in an ice bath
(10min)
⇩
dissolve the solids with 50 ml of milliQ
water
⇩
separate liquid phase and organ phase in a separatory
funnel.
⇩
wash the organic phase with 10ml brine
⇩
dry the organ phase with magnesium sulfate and use
gravity filtration to filter the solution
⇩
evaporate the solution to get rid of remaining toluene,
(boiling point 110 degrees)
⇩
record the yield and run IR-spectra
Theoretical yield: 0,04x92,14g/mol(starting matherial)=
3,7g maximum
Weight of the rounded bottom flask= 96,33g
weight of the rounded bottom flask + products solution=
102,2g
weight of the products solution= 102,2-96,33=
5,87g
Yield= 5.87g/3,7gx100= 125%. why?