How did you get the [H+] = 0.00715m What is the pH of a 0.40 M H2Se solution that has the stepwise dissociation constants Ka1 =1.4x10-4 and Ka2 = 1.0x10-11

i think that the answer is c

there are two significant figures.

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

answer7,570,82356 cubic centimeters;