At 20°C, how many grams of potassium nitrate can be
dissolved in 100 g of water?

32 g of potassium nitrate can be dissolved in 100 g of water at 20°C.

Explanation:

The measure of amount of any kind of solute getting dissolved in any solvent is termed as solubility. The solubility can be measured as the ratio of mass of the solute to the mass of the solvent at room temperature. It is also known that the solubility of any solution depends on the temperature. When the concentration of solute exceeds the solubility limit, the solution becomes saturated.

As it is known from the solubility graph of potassium nitrate salt that at 20°C, 32 g/100 g is the solubility limit of potassium nitrate in 100 g of water.

So this means that 32 g of potassium nitrate can be dissolved in 100 g of water at 20°C.

At 20 °C, 30 grams of potassium nitrate can be dissolved in 100 g of water.

Explanation:

When 30 grams of potassium nitrate, KNO3 , is dissolved in 100

grams of water at 20 °C, the solution can be described as saturated.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

catya your not at all which answer i've seen you do this on another question!