What mass of precipitate (in g) is formed when 20.5 mL of 0.700 M Zn(NO₃)₂ reacts with 21.0 mL of 0.700 M NaOH in the following chemical reaction? Zn(NO₃)₂(aq) + 2NaOH(aq) → Zn(OH)₂(s) + 2NaNO₃(aq)