actually it is 5% of 100 is 5
Therefore, 5% of 500 is 5 x 5 = 25g
Answer:

Explanation:
Hello,
In this case, we can analyze the colligative property of solutions - freezing point depression - for the formed solution when ethylene glycol mixes with water. Thus, since water freezes at 0 °C, we can compute the freezing point of the solution as shown below:

Whereas the van't Hoff factor for this solute is 1 as it is nonionizing and the molality is:

Thus, we obtain:

Best regards.
I know 4 is acidic so it has to be 9