5. a 25.0 gram sample of a compound contains 6.64 grams of potassium (k, at. wt. = 39.1), 8.84
grams of chromium (cr, at. wt. = 52.0), and 9.52 grams of oxygen (0, at. wt. = 16.0). find the empirical
formula of this compound.
a. k3cr03
ki cr 2 02
b. k2cro4
c. k2cr207
d. k7cr202
e. kcr04

true

explanation:

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.