How much energy is consumed by thawing 4.3 g ice?
O A. 4.3 g x 1 mol/18.02 g 6.03 kJ/mol
B. 4.3 g x 1 mol/18.02 g x 4.186 kJ/mol
C. 4.3 g x 1 mol/18.02g x 40.65 kJ/mol
D. 4.3 g x 1 mol/18.02 g * (-285.83) kJ/mol

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.

there are two significant figures.