Answer :
Answer is: The mass of the blood Keona donates is 501.157 grams.
d(blood) = 1.06 g/mL; density of the blood.
V(blood) = 473.176 mL; volume of the blood.
m(blood) = ?.
m(blood) = d(blood) · V(blood).
m(blood) = 1.06 g/mL · 473.176 mL.
m(blood) = 501.157 g; mass of the blood.