This question has multiple parts. Part A:
A sample of unknown hydrate, AC-XH20, has a mass of 1.000 g before heating and a
mass of 0.781 g after heating. What is the experimental percentage of water in this
unknown hydrate?

21.9% is the experimental percentage of water in the unknown hydrate.

Explanation:

The mass of an unknown hydrate = 1.000 g

The mass of hydrate after heating = 0.781 g

The mass of water lost due to heating = x

The experimental percentage of water in the unknown hydrate:

21.9% is the experimental percentage of water in the unknown hydrate.

im pretty sure its b

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.