Final Answer:
The mass of solid required to make a 0.0130 mol/L solution from 100.0 mL of solid magnesium permanganate trihydrate would depend on the molar mass of the compound and cannot be determined solely from the provided information.
Step-by-step explanation:
To calculate the mass of the solid required, one needs the molar mass of magnesium permanganate trihydrate (Mg(MnO₄)₃·3H₂O). This information is crucial because it allows you to convert moles to grams using the formula mass. The concentration of the solution (0.0130 mol/L) and the volume (100.0 mL) provide the moles of solute. However, without the molar mass, the conversion to grams is not possible. Once the molar mass is known, you can use the formula "mass = moles × molar mass" to find the required mass of solid.