Question

Calculate the concentration in molality of calcium phosphate in a solution containing 250.0 grams of pure water when the freezing point is -8.5 C

Answer 1

The function:
f ( x ) = x * 0.965^t
where x is the initial amount and t is the number of the years
80 = x * 0.965^3
80 = x  *  0.89632
x = 80 : 0.89632 ≈ 89
Answer:
The initial amount of animals was 89.