Answer:
D i think. Not sure.
Explanation:
I mean i just did it myself, and i dont really do chemistry, but I would say D sorrry if i made you get it wrong!!
12 Dahlias, 30 Tulips
12:30
12/2=6
30/6=5
12/6=2
=2:5
Assuming that the ammonium sulfide formula is (NH4)2S then you can see that there are 2 nitrogen, 8 hydrogen and 2 sulfur atoms for every ammonium sulfide. If the amount of ammonium sulfide is 8.9 moles, then the number of hydrogen atoms should be: 8/1 * 8.9 mol= 71.2 moles
I think you add 29.57 + 80 and the answer would be 30.37
