What volume, in liters, is needed to make a 3.50 M solution that contains 8.75 moles of KF?
0 0.400 L
O 30.6L
0 2.50 L
0 1.50 L

the answer for sodium is 0.186

the answer for rubidium is 0.251

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.

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