The density of 300 ml of water was determined, and then 15 grams of sodium nitrate was dissolved in the water. the student determined the density of the aqueous solution and recorded the collected data in a table. the sodium nitrate in this investigation is
a. the solute
b. undergoing chemical change
c. the solvent
d. changing from a solid to a gas

the sodium nitrate in this investigation is

a) the solute

b) undergoing chemical change

generally, solute is the substance which is added in solvent.

The substance which is taken in relatively more volume is the solvent.

so, here sodium nitrate (NaNO₃) is the solute which is dissolved in water (H₂O) , which is solvent.

The reaction between them is :

NaNO₃ + H₂O ⇒ Na⁺ (aq) + NO₃⁻ (aq) ;     (aq) denotes aqueous;

so, here sodium nitrate undergoes chemical change into aqueous sodium ions(Na⁺) and aqueous nitrate ions(NO₃⁻).

if you're asking what comes out, it's steam.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year