At an atmospheric pressure of 745 mm hg, what is the pressure of he gas inside a cylinder that is attached to an open-end manometer in which the level of mercury in the open side of the manometer is 25 mm hg higher than the side that is attached to the gas cylinder?

770 mmHg

Explanation:

For definition mmHg is a unit of medition of pressure equivalent to the pressure exerted by a column of mercury 1 millimeter high at 0°C and under the acceleration of gravity

So, If the level of mercury on the open side of the pressure gauge is 25 mm Hg higher than the side connected to the gas cylinder, 25mm Hg must be added to the atmospheric pressure

745mm Hg +25mmHg =770mmHg

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.