2. How much potassium hydroxide do you need to dissolve in 500 cm3 in order to obtain a concentration of 0.1 mol dm-3 ?

Okay this will take 1 hour okay dont forget me.

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

No because it not possibly