Question

IF THE BURNING IF MAGNESIUM IS INCOMPLETE HOW WILL this procedural error affect the reported mass of : 1- MAGNESIUM in MAGNESIUM oxide 2- oxygen in MAGNESIUM oxide

Answer 1

To calculate the mass or percent error you need to do the following:

First: Find procedural error that affects the mass of magnesium oxide: So if Mg reacted incompletely the mass of MgO is lower than theoretical:

W is "yeild"

m' is mass of Mg

m is mass of MgO

m" is mass of O

m' m

2Mg + O2=2MgO

2*24.3 2*(24.3+16)

m=40.3m'/24.3=1.66m'

If reacted 90% you'll get m=0.9*1.66m'

Second: Find procedural error that affects the mass of oxygen in magnesium oxide: Now you need to conect unreacted Mg with O from MgO

2Mg + O2=2MgO

The scheme of this process is:

m' m"

2Mg--->O

2*24.3 16

m"=16*m'/2*24.3=0.33m'