Equal amounts of gases A and B are placed in a closed reactor. A and B react to combine into AB in the following equilibrium reaction: A + B ⇌ AB Which are true about this system? Select two that apply. -A closed system allows for the transfer of energy in and out, so energy is not conserved in this system. -The total mass in the reactor gradually becomes zero because mass is consumed in closed systems. -The total mass in the reactor remains the same because products are removed from closed systems. -The total mass in the reactor remains the same because mass is conserved in closed systems.

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the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

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