GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect therapeutic levels of dissolved digoxin (1.5 to 2.0 ng/ml.), using a blood sample that is as small as 25. pl.. Calculate the minimum mass in nanograms of digoxin that the new system must be able to detect. Round your answer to 2 significant digits. 0PR X

GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect therapeutic levels of dissolved digoxin (1.5 to 2.0 ng/ml.), using a blood sample that is as small as 25. pl.. Calculate the minimum mass in nanograms of digoxin that the new system must be able to detect. Round your answer to 2 significant digits. 0PR X

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter2: Measurements And Calculations

Section: Chapter Questions

Problem 130AP: Which weighs more, 0.001 g of water or 1 mg of water?

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Which weighs more, 0.001 g of water or 1 mg of water?
GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect therapeutic levels of dissolved digoxin (1.5 to 2.0/ngmL), using a blood sample that is as small as 6.0μL. Calculate the minimum mass in nanograms of digoxin that the new system must be able to detect. Be sure your answer has the correct number of significant digits.
GenAlex Medical, a leading manufacturer of medical laboratory equipment, is designing a new automated system that can detect borderline high levels of dissolved cholesterol (170.to 200./mgdL), using a blood sample that is as small as 4.0mL Calculate the minimum mass in milligrams of cholesterol that the new system must be able to detect. Round your answer to 3 significant digits.
The mass of a beaker is 5.333 g. After 5.00 mL of a concentated hydrochloric acid solution is pipet Ted into the beaker, the combined mass of the beaker and the hydrochloric acid sample is 11.229 g. From the data, what is the measured density of the hydrochloric acid solution?
A chemist must prepare 975.mL of 3.00M aqueous sodium nitrate NaNO3 working solution. He'll do this by pouring out some 5.68M aqueous sodium nitrate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the sodium nitrate stock solution that the chemist should pour out. Round your answer to 3 significant digits. mL
A student obtains the following data: a- Mass of evaporating dish 21.345 g b- Mass of evaporating dish and saturated NaCl solution 42.817 g c- Mass of dish and NaCl after evaporation 38.915 g Report the Mass % of NaCl in this solution. Write the number as a percentage with the correct number of significant figures as shown. (i.e. 25%) There should be no space between the numbers and the % sign.
A chemist must dilute 78.3 mL of 9.91 mM aqueous calcium sulfate (CaSO4) solution until the concentration falls to 3.00 mM. She'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits. ÚL x10 ?
A sailor on a trans-Pacific solo voyage notices one day that if he puts 385.mL of fresh water into a plastic cup weighing 15.0g, the cup floats in the seawater around his boat with the fresh water inside the cup at exactly the same level as the seawater outside the cup. Calculate the amount of salt dissolved in each liter of seawater. Be sure your answer has a unit symbol, if needed, and round it to 2 significant digits. You'll need to know that the density of fresh water at the temperature of the sea around the sailor is 0.999g/cm3. You'll also want to remember Archimedes' Principle, that objects float when they displace a mass of water equal to their own mass.
9.1. The egg whites from four "large" eggs occupy a volume of 112mL. The mass of the egg whites from these four eggs is 1.20 X 102 g. What is the average density of an egg white from one "large" egg? 9.2. A solid with an irregular shape and a mass of 11.33 g is added to a graduated cylinder filled with water (d=1.00g/mL) to the 35.0-mL mark. After the solid sinks to the bottom, the water level is read to be at the 42.3-mL mark. What is the density of the solid? 9.3. Magnesium chloride is an important coagulant used in the preparation of tofu from soy milk. Its solubility in water at 20oC is 54.6 g/100 g. At 80oC, its solubility is 66.1 g/ 100 g. A mixture is made up of 16.2 g of magnesium chloride and 38.2 g of water at 20oC. a. Is the mixture homogeneous? If it is, how many more grams of magnesium chloride are required to make a saturated solution? If the mixture is not homogeneous, how many grams of magnesium chloride are undissolved? b. How many more grams of magnesium chloride…
A piece of cardboard is 12.0 cm long, 6.3 cm wide and 0.75 millimeters thick. What is the volume of this piece of cardboard in cubic meters? Enter your answer in the space provided WITHOUT units. Make sure to round your answer to the correct number of significant figures. Please give the number as a normal number, do not use scientific notation. (In example: a normal number = 4300 instead of the number being in scientific notation as = 4.3 X 103)
Hydrocortisone is used as an anti-inflammatory for localized pain. You need to prepare a 45 mg/mL solution of hydrocortisone for an injection via a dilution. You have 15 mL of a 175 mg/mL stock solution of hydrocortisone available. How many mL of the 45 mg/mL solution can you prepare? Note: Provide your answer using the correct number of significant figures and remember to include your units.
If 10.00 mL (measured using a volumetric pipette) of a solution is pipetted into a 50 mL beaker which weighs 43.015 g an the combined mass of the beaker and liguid is 57.762 g, what is the density of the liquid? Your answer should have 4 sig. figs