The answer is C. more better. Like I'm better everyday :D
GIVE ME MORE QUESTIONS FOR MORE POINTS PLEASE :D
have a nice day :) happy new year
Answer:
nitrogen
Explanation:
The stoichiometry of the reaction says that 
and 
react 3:1 to form 2 moles of 
, so, if you have 3,5 moles of H, which is equal to 1,75 moles of , and 5 moles of N, which are equal to 2,5 moles of 
. only
=0.583 moles of , will react, leaving <em>1.917 moles of </em> <em>unreacted</em>, and forming 0.583*2=1.166 moles of
For a solid I would say something like aerogel would have a large volume but very little mass.
Let me know if this helped or not.
