1) type your answer for physical states using the format of g for gas, l for liquid, and s for solid. if more than one physical state is present, enter the physical states separated by a comma.
(2) type your answer for trends using the format of increase, decrease, remains constant.
(3) type your answer for changes in physical state, for example solid to liquid to gas, using the format s> l> g.

yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes

explanation:

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

catya your not at all which answer i've seen you do this on another question!

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.