Answer:
64 °C
Explanation:
I’m guessing that “they” are asking you to interpret a solubility curve something like the one below.
Find the point at 300 g/100 mL water on the vertical axis.
From there, draw a horizontal line until it meets the solubility curve of sugar.
Then, drop a vertical line to the temperature axis.
It appears to hit the axis at about 64 °C.
The solution is saturated at this temperature, so 64 °C is the lowest temperature at which you can dissolve 300 g of sugar in 100 mL of water.
