Astudent neutralized 16.4 milliliters of hcl by adding 12.7 milliliters of 0.620 m koh. what was the molarity of the hcl acid?
(1) 0.168 m (3) 0.620 m
(2) 0.480 m (4) 0.801 m

Molarity is equal to the moles of solute over liters of solvent. In getting the molarity of HCl, you must know the formula for two solutions which is equal to M1V1 = M2V2.  (16.4 milliliters of HCl)M1 = (12.7 milliliters) (0.620 M KOH) and you have 0.480M HCl. The answer is number 2.

a electronegativity decreases beacuse the size of nucleus is bigger.

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.