Akno3 solution containing 47 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?

When water is cooled from to , the temperature of the solution is decreases. Due to decrease in temperature, the intermolecular forces which are present between the solute particles will not break easily.

Decrease in temperature also results in the decrease in solubility. Thus, due to decrease in temperature,   will precipitate implies that the solubility of in water decreases.

Hence, precipitation of occurs.

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considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.