In 50 grams of water at 90°C, it is expected 35 grams will dissolve considering the solublity is 70g/ 100 grams of water.
Solubility increases when temperature increases, which means more grams of a substance can be disolved if temperature is higher.
The best is through a solubility curve chart as the one below.
As observe in the graph the solubility at 90°C using 100 grams of water is 70g/ 100 grams of water; this implies in 50 grams the solubility is 30 grams.
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