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At 30 degrees C, when 90 grams of NaNO3 is dissolved in 100  grams of water, the solution becomes UNSATURATED.

A saturated solution is a solution that doesn't completely dissolve the solute.

An unsaturated solution is a solution that has a lesser amount of solute than the saturated solution in which it is being dissolved. Thus, the solute will be completely dissolved in the solution at the end of the reaction process.

From the given information:

  • NaNO3(salt) is the solute
  • water is the solvent.

Since the mass of the solute is lesser than the solvent. It implies that the solute will dissolve completely in the solvent.

Therefore, the solution becomes unsaturated.

Learn more about  unsaturated solutions here:

https://brainly.com/question/11440974?referrer=searchResults