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A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.314 g. When filled with distilled water at
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Chemistry: The Molecular Nature of Matter
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- 1.) In the Dumas method for determining the molar mass of an unknown volatile liquid, a sample of a volatile liquid that boils below 100 oC is vaporized in a boiling water bath and the mass of the vapor required to fill the flask is determined. The following data was collected: Flask Volume 100.0 +100.0 + 79.6 mL = 279.6 mL Mass of Flask + Cap 143.85 g Mass of Flask + Condensed Liquid 144.95 g Mass of Condensed Liquid 1.10 g Temperature of Water Bath (oC) 84.1 oC Barometric Pressure (atm) 0.985 atm a.) What is the molar mass of the unknown? b.) What will its temperature be when the pressure is 1.20 atm and the volume is 250.0 mL?arrow_forwardA chemist prepares a solution of barium chlorate BaClO32 by measuring out 63.μmol of barium chlorate into a 250.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mol/L of the chemist's barium chlorate solution. Be sure your answer has the correct number of significant digits.arrow_forward(a) Carbon monoxide (CO) is a poisonous gas because it binds very strongly to the oxygen carrier hemoglobin in blood. A concentration of 8.00 × 102 ppm by volume of carbon monoxide is considered lethal to humans. Calculate the volume in liters occupied by carbon monoxide in a room that measures 17.6 m long, 8.80 m wide, and 2.64 m high at this concentration.(b) Prolonged exposure to mercury (Hg) vapor can cause neurological disorders and respiratory problems. For safe air quality control, the concentration of mercury vapor must be under 0.050 mg/m3 . Convert this number to g/L. (c) The general test for type II diabetes is that the blood sugar (glucose) level should be below 120 mg per deciliter (mg/dL). Convert this number to micrograms per milliliter (μg/mL).arrow_forward
- A chemistry student needs 70.0mL of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of pentane is ·0.626gcm−3 . Calculate the mass of pentane the student should weigh out.arrow_forwardA chemistry student weighs out 72. g of an unknown solid compound X and adds it to 550. mL of distilled water at 19.° C .After 10 minutes of stirring, only some of the X has dissolved. The student drains off the solution, then washes, dries and weighs the X that did not dissolve. It weighs 64. g .arrow_forwardIn our chemistry laboratory class, the formula for surface tension given is y=mg/2(pi) x r x f where y=surface tension, m= mass of the drop, g= gravitational acceleration, pi is 3.1415, r= outer radius of burette, f=correction factor. Now I searched the internet and it says that the unit for surface tension is kg x m/s^2. The problem is I have grams for the mass of the drop and that the outer radius of the burette is in centimeter while the gravitational acceleration is in meter. What will happen is like this: (1 g x 9.8 m/s^2) / 2 (3.1415) x 0.15 cm x 0.74643 (correction factor no unit) As you can see, if I don't cancel m and cm, the unit will be g x cm x m x s^2. However if change the radius of the burette into meter, it will cancel, the unit will be g x s^2 (missing meter). What can I do to get kg x m/s^2 as the unit for final answer?arrow_forward
- The liquid 1,2-dibromobenzene has a density of 1.98 g/mL at 20 °C. If a 2.61 kilogram sample of this compound is needed, how many liters of the liquid at 20 °C must be provided?arrow_forwardA chemist prepares a solution of silver(I) nitrate (AgNO3) by measuring out 1.9 × 10 μmol of silver(I) nitrate into a 500. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's silver(I) nitrate solution. Be sure your answer has the correct number of significant digits. mmol L X 3arrow_forwardDensity of an aqueous solution of nitric acid is 1.43 g/mL. If this solutioin contained 36.0% nitric acid by mass, what volume of solution would be needed to supply 1.50 mmol of nitric acid?arrow_forward
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