If the Temperature at the base of a mountain is 35°C and the pressure
is 1.0atm, what must the Pressure be at the top of the mountain,
where the Temperature is the freezing point of water?

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

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.