To prepare 1000ml 50% ethyl alcohol from 80% ethyl alcohol, which of the following solutions are needed? with explanation too please. Thank you.
a. 625 mL 80% ethyl alcohol & 375 mL distilled water
b. 62.5 mL 80% alcohol & 937.5 mL distilled water
c. 6.25 mL 80% ethyl alcohol & 963.75 mL distilled water
d. 450 mL 80% ethyl alcohol & 550 mL distilled water