Heat of vaporization (During which the temperature stays the same)
According to the chemical equation, the ratio between Ca and HCl for a complete reaction is 1:2. The moles of Ca can be calculated by mass/molar mass, thus 60.0 g/40 g/mole = 1.5 mole. So the moles of HCl in the solution is 1.5mole*2 = 3 mole.
So the volume of HCl solution = Moles of HCl/ concentration of HCl = 3 mole/ 1.25 M = 2.4 L = 2400 mL
It is an inverse relationship such that when in this case one circumstance is decreased ie the volume of the gas container then the other circumstance the gas pressure increases as opposed to being directly proportional whereby say if water is cooled enough it will turn to ice ie a cold substance.
The energy would be 3.31*10-19J