Which of the following processes are spontaneous? i. dissolving more solute in an unsaturated solution ii. dissolving more solute in a saturated solution iii. dissolving more solute in a suspersaturated solution

I. dissolving more solute in an unsaturated solution

Explanation:

A saturated solution is the solution which contains maximum concentration of solute dissolved in solvent.

However, if the solution is being provided with energy (heating) , it will dissolve more heat and the solution that cannot even dissolve more solute after heating is super saturated solution.

Both saturated and supersaturated solutions have maximum of their capacity to dissolve the solute and hence further energy requires energy and these processes are non-spontaneous.

An unsaturated solution can dissolve more solute easily and thus is a spontaneous process.

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the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3