1. C would be true. A normal blood pressure of "120/80" means 120 mm Hg systolic and 80 mm Hg diastolic, which is 0.16 atm and 0.11 atm, respectively. These pressures are due to the pumping action of the heart. A container of blood or a solution of similar concentration will not create a pressure of 7 atm against the wall of the container!
2. Just plug into PV = nRT and solve for T. n is the moles of Cl2 gas. If you use R = 0.0821 L atm / mol K, V has to be in liters and P has to be in atmospheres. T will be in Kelvins.
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