When ethane (C2H6) reacts with chlorine (Cl) then the main subject is C2H5Cl but also a small amount of other substances containing Cl such as C2H4Cl2. a) Calculate the theoretical efficiency of C2H5Cl when 125 g
of C2H6 reacts with 255 g of Cl2 if only C2H5Cl and HCl are assumed to be formed.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

it is b that is the answer.