Answer:
\large \boxed{5}
Explanation:
Molecules of NH₄OH do not exist.
If they did, however, here is how you might answer.
Total H atoms = 39 H
-7H₂O =<u> 14 </u>
H atoms available = 25 H
Each "molecule" of NH₄OH contains five H atoms.

B. compound a material that contains three elements joined in a fixed proportion
Answer:
9.0 g/cm³
Explanation:
Density can be computed with the formula:

Where:
D = Density
M = Mass
V = Volume
In your problem we are given:
84 cm³ = volume
760 g = mass
So we just plug in our given into the formula:



The answer would then be:
9.0 g/cm³
C. Lowering the temperature
At the lower temperature, particles have less kinetic energy, so they move slower.