Calculate the grams of NaHCO3 by multiplying the moles of NaHCO3 by the molecular weight of NaHCO3 (84.007 g/mol).

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.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.