Question
#26
I know the answer for it but im not sure of how or why?
+ Automatic Zoom - a acompound. b. an electrolyte. c. a solution. e. a mess. Concentrated sulfuric acid contains 4 g of water for every 100 g of solution. The solvent is a. water. b. sulfuric acid. c. concentrated 24, the same as the solution. the same as the solute in this case. d. e. 25. Human blood contains about 0.18 g potassium ions per liter and has a density of 1.06 g/mL. What is the concentration of potassium ions in blood expressed in parts per million? a. 18 ppm b. 180 ppm c. 170 ppm d. 88 ppm e. 880 ppm A medical saline solution is prepared by mixing 55 mg of morphine (C1HNO:) with water to make 75.0 mL of solution. What is the millimolar concentration of this solution? 26. d. 14.5 mM a. 1.45 x 102 mM b. 2.57 mM e. 2.09 x 10' mM c. 3.69 x 10-7 mM 27. How many grams of solid magnesium chloride, MgCh, are needed to make 250 mL of 0.50 M solution? a. 9.5 g b. 48 g c. 12 g d. 125 g c. 4.8 g 28. Which contains more solute particles: a 0.10 M aqueous solution of methanol (CH,OH) or a 0.10 M aqueous
Explanation / Answer
26)
75.0 mL = 0.075 L
Molar mass of morphine (C17H19NO3) = 285.34 g/mol
55 mg C17H19NO3 = 0.055 g C17H19NO3
moles of C17H19NO3 = 0.055 g C17H19NO3 x (1 mol C17H19NO3 / 285.34 g C17H19NO3) = 0.0001927 mol C17H19NO3.
Molarity = 0.0001927 mol /0.075 L = 0.00257 M
Now we will convert M to mm as,
0.00257 M x (1000 mM / 1M) = 2.57 mM
Hence, the answer is (b) 2.57 mM.
