Question

The concentration of sugar (glucose, C₆H₁₂O₆) in human blood ranges from about 80 mg/dL before meals to 120 mg/dL after eating. The abbreviation dL stands for deciliter = 0.1 L. Find the molarity of glucose in blood before and after eating.

Answer 1

Answer – We are given the, human blood ranges from about 80 mg/dL before meals to 120 mg/dL after eating.

1 dL = 0.1 L

Mass of glucose before meal = 80 mg = 0.080 g

Mass of glucose after eating = 120 mg = 0.120 g

So, moles of glucose = 0.080 g / 180.16 g.mol^-1

                                  = 0.000444 moles

Moles of glucose = 0.120 g / 180.16 g.mol^-1

                             = 0.000666 moles

So, molarity of glucose in blood before eating = 0.000444 moles / 0.1 L

                                                                          = 0.00444 M

molarity of glucose in blood after eating = 0.000666 moles / 0.1 L

                                                                  = 0.00666 M