7. Titanium can be extracted from its ore by two different methods. One uses a more reactive metal to displace the titanium:
TiO2 + 2 Mg -Ti + 2 Mgo
The second method is electrolysis of the ore. The overall reaction for this method is:
Tio, Ti + O2
a)
Calculate the atom economy for each reaction.
b)
Which method is 'greener'? What else might you want to know before making a final
decision?
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1 is the answer to this problem

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.