Energy per gram released by chocolate answer in kJ/g
1000J=1kJ
600.0g water warmed up

Chocolate:
initial mass 16.32g
final mass 15.02g
change in mass 1.30g
initial temp of water 20.0°C
final temp of water 31.6°C
change in water temp 11.6°C​

a

explanation:

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

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.