# How many grams of NaNO_3 will dissolve in 50 mL of water at 10°C?

The site reports a solubility of $80.8 \cdot g$ of salt in $100 \cdot m L$ of water at $10$ ""^@C. You want the solubiliy in $50 \cdot m L$ of water, so I think it is clear how you assess this.