Sorry I came a lil late,
The answer to your question is, 2.
Hope this helps! :)
Answer: Skier 1 will have more potential energy because he is higher than skier 2
Explanation: Gravitational potential energy is the energy possessed by a body by virtue of its position or height.
P.E=
m= mass of the body
g= acceleration due to gravity
h= height of body
Thus if the masses of two bodies are same, the one with greater height possess greater potential energy.
The answer is 0.25 moles because one mole of NH3 would have apporximately 6.02X10^23 molecules