Apatient's blood test shows that her hemoglobin concentration is 15.2 g/dl. how many milligrams of hemoglobin are in
every 3.50 ml of the patient's blood?
mass of hemoglobin =
mg

Taking into account the definition of mass per volume concentration and the change of units, 532 milligrams of hemoglobin are in  every 3.50 mL of the patient's blood.

You know that the concentration of hemoglobin in the blood is 15.2 . So, in first place, you need to change units: the g in mg and the dL in mL.

You know that 1 dL= 100 mL and 1 g= 1000 mg. Then:

Then you can apply the following rule of three: if 1 mL contains 152 mg of hemoglobin, 3.5 mL contains how much mass of hemoglobin?

mass of hemoglobin= 532 mg

Finally, 532 milligrams of hemoglobin are in  every 3.50 mL of the patient's blood.

Learn more about mass per volume concentration:

link

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.