Oxygen is the correct answer.
Answer:
Percentage of mass of solute in aqueous phase is 28.57%.
Explanation:
- Fraction of solute in aqueous phase.

= Used volume of aqueous solution
= Used volume of organic solution
D = partition coefficient.

Mass of solute in aqueous phase = 

Therefore, Percentage of mass of solute in aqueous phase is 28.57%.
Answer:
2 grams
Explanation:
One MOLE of hydrogen atoms contains the same number of atoms as the number of hydrogen molecules in one MOLE of hydrogen molecules, i.e., Avagadros number. However, one mole of hydrogen atoms has a mass of 1 gram while one MOLE of hydrogen molecules has a mass of 2 grams.