Answer:

Solubility of potassium nitrate at 313K = 62/100

100 g of water contains potassium nitrate = 62 g

50 g of water contains potassium nitrate = 62/100 X 50 = 31g

Thus, 31 g potassium nitrate would be needed to produce a saturated solution of potassium nitrate in 50 g of water at 313 K.

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