Question

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

Answer 1

See this site.

Explanation:

Nitrates tend to be very soluble in aqueous media, which is arguably the result of the delocalization of the negative charge of the anion. (You know the drill: all nitrates and perchlorates are soluble.)

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