Answer:
earth I think like that because earth is the second planet
Three classes: 28×3=84 students
8 test tubes per student: 84× 8= 672
hope this helps!
Autoionization Reactions are those reactions in which ions or molecules ionizes spontaneously without adding any external reagent.
For Example,
Autoionization of water.
H₂O + H₂O ⇆ H₃O⁺ + OH⁻
Autoionization reaction of Methanol is shown below,