How many moles of electrons is required to deposit 5.6g of iorn from a solution of iron (ii) tetraoxosulphate (vi) (fe=56,s=32,o=16)

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.