Question number 1 they are asking for highest possible theoretical temperature?

I think the highest theoretical temperature would be 36.5°C.

Hope I helped, sorry if not.

the formula for the conversion of temperature from degree celsius to kelvin is:

the sample of water at is converted to kelvin temperature by using the above formula as:

on comparing the two samples of water at or we can say that at and at respectively. the difference between the temperatures of two samples of water is:

hence, one can say that the sample of water at is greater than the sample of water at by .

yes the answer is total mass in unchanged   : )