Answer
-72
Step-by-step explanation:
The difference between each can be achieved by subtracting -42 (the freezing point of the acid) to -114 (the freezing point of the alcohol).
From there, we get the equation -114 - -42, which then leads to equal -72.
A way I check this is that I go back and add our answer to the lowest term, which becomes -42 + -72, which does, in fact, equal -114.
So your answer is -72.
