5.In the laboratory, hydrogen gas is usually made by the following reaction: Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq). H2 gas is collected over water with a total pressure of 752 mm Hg and a temperature of 20.0°C. How many liters of H2 gas can be produced from 3.566 g of Zn and excess HCl? Molar mass of Zn is 65.38 g/mol and molar mass of H2 is 2.016g / mol.
A possibly useful table of water vapor pressures is provided below.
T (°C) P (mm Hg)
20 17.55
25 23.78
30 31.86

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.

it is b that is the answer.