They will mold into different shapes
A) Na2S
b) AlF3
c) O2
d) C6H12O6
It actually depends on the percentage of the concentration give. Percentages can be expressed as %mass/mass, %volume/volume or %mass/volume. To keep things simple, let's just assume that it is in %volume/volume. Thus, 13% of 520 mL is pure acid.
Volume of pure acid = 520*0.13 = 67.6 mL
D. F
Molecules are a group of bonded atoms but Fluorine stands on its own