Endothermic means it absorb energy from surrounding and its sign is positive so when it absorb this energy the flask or the container become colder
The answer would be 425.599 because 1 ATM is 760 mmHg.
For the first part, use the question M=mol/vol (liters)
To do this, you have the given 1.6 M solution
divide the 360g by the molar mass of ethanol (44.07) to get moles
360/44.07=8.16 mol
so
1.6M = 8.16 mol/x vol
volume: 5.1 Liters