Final answer:
To determine how much NaN3 remains in solution at 20°C, we need to compare the solubility of NaN3 at 50°C and 20°C. The solubility of NaN3 at 50°C is given (82 g in 75 g of water), but we need to determine the solubility at 20°C.
Step-by-step explanation:
To find the amount of NaN3 that remains in solution at 20°C, we need to use the principle of solubility. The solubility of a compound typically increases with temperature, meaning that more of the compound can dissolve in the solvent (water) as the temperature increases. Therefore, as the solution cools from 50°C to 20°C, some of the NaN3 will likely precipitate out of the solution.
To determine how much NaN3 remains in solution at 20°C, we need to compare the solubility of NaN3 at 50°C and 20°C. The solubility of NaN3 at 50°C is given (82 g in 75 g of water), but we need to determine the solubility at 20°C.
Unfortunately, the solubility of NaN3 at different temperatures is not provided. To obtain this information, you would need to consult a solubility table or find a reliable source that provides the solubility of NaN3 at different temperatures.