Answer:
55.845 u
Explanation:
Fe, iron, has 29 neutrons and a atomic mass of 55.845 u
Answer: Ca
6.
G, H, O, N, Na, P
There are 6 different elements listed, with O (oxygen) showing up twice.
by stoichiometry
nNH3/2=nH2/3
0.25/2=nH2/3
nH2=0.25×3/2
nH2=0.375 mol
so its 0.38 mol
