Correct answer was B and E pls explain I've been stuck on this two for days

an Many Ford Fiestas have 1.0 L 13 engines. This means that there are three cylinders, each of which changes volume by 333 mL as the pistons move in and out. Assuming the pistons are pushing against a constant external pressure" of ~300 psi (20.4 atm), what is the approximate amount of work that each cylinder can contribute each time the combustion reaction inside the cylinder pushes the piston out? (a) 6.8 J (b) 690 J (c) 6800 J (d) 690,000 J (e) 6800 kJ W = Pyar 8. Do CaCrO4 is generally considered insoluble (Ksp of CaCrO4 = 7.1x104). Will a precipitate form if 100. mL of 0.0300 M Na2CrO4 is mixed with 100. mL of 0.0300 M CaCl2? Najlede tallata [0,03] [ow] (a) Yes, chromates are generally considered insoluble. (b) Yes, Q>K (c) Yes, QK (e) No, Q