CHEMICAL REACTIONS = Calculating molarity using solute moles A chemist prepares a solution of magnesium fluoride (MgF2) by measuring out 0.023 umol of magnesium fluoride into a 450. mL volumetric flask and fillin the flask to the mark with water. Calculate the concentration in mol/L of the chemist's magnesium fluoride solution. Be sure your answer has the correct number of significant digits.

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.

c. 4.54 x 10–12 j happens to be correct