I need to know the solubility of potassium chloride in g / 100 mL of H2O at 60.0 Celsius from both the experimental and official solubility curves; also calculate the percent difference between the two values

Mgo2 is the oxidation state of manganese oxide

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na