1.4A1 + 30, --->__A1,03 I
2. NH3 + _02 ---> 2NO +
_HO
3._FeS + __O_ ---> __Fe,0, + 480,
4.6KOH +
_H3PO
K3PO4 + _H2O
5. __Ba, N, + 12HF -
BaF, +
_NH3

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

Ineed to find the answer of this question because i dont understand it

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury