When you standardized the na2s2o3, what molarity of na2s2o3 did you obtain? v(na2s2o3): 6.5 ml v(kio3)l: 5.0 ml stoichiometric factor ( number of moles of na2s2o3 reacting with one mole of kio3): 6

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

lol for the pointsss

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.