A commercially available product contains 18 g of ointment with a drug concentration of 5 % w/w. A prescription calls for fortification of the ointment to a 15 % w/w concentration. What mass of pure drug, in units of grams, should be added to the ointment to make an ointment of 15 % w/w concentration?
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A commercially available product contains 18 g of ointment with a drug concentration of 5 % w/w. A prescription calls for fortification of the ointment to a 15 % w/w concentration. What mass of pure drug, in units of grams, should be added to the ointment to make an ointment of 15 % w/w concentration?
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- 1.0 kg of an ideal gas at normal atmospheric pressure was heated in a 1 m3 container until the temperature was doubled while maintaining the pressure. What is the final volume?The pressure of an ideal gas at a constant temperature is 400 Pa. and its volume is 3.0 liters. If the pressure is increased to 600 Pa., what is the new volume? A: 0.83 liters B: 2.0 liters C: 1.8 liters D: 1.6 liters E: 9.0 litersA container of gas holds 1.04 moles of neon gas. If the volume of the container is 10.1 liters and the pressure inside is 2.4 atm, what is the temperature (in K) of the gas?
- A gas at 740 mm Hg and 18°C has a volume of 400 cc undergoes a pressure until the pressure becomes 760 mm Hg and temperature of 0°C. What is the final volume of the gas?Problem 1: Answer the following questions using the table to the right. Medium Gases at 0 °C, 1 atm Air Carbon dioxide Hydrogen Oxygen 1.000293 1.00045 1.000139 1.000271 Liquids at 20 °C Benzene Carbon disulfide Carbon tetrachloride Ethanol Glycerine Water, fresh 1.501 1.628 1.461 1.361 1.473 1.333 Solids at 20 °C Diamond Fluorite Glass, crown 2.419 1.434 1.52 Glass, flint |Ice (at 0 °C) Polystyrene Plexiglas Quartz, crystalline Quartz, fused Sodium chloride 1.66 1.309 1.49 1.51 1.544 1.458 1.544 Zircon 1.923 Part (a) Calculate the index of refraction for a medium in which the speed of light is 2.012 × 10°. Numeric : Anumeric value is expected and not an expression. Part (b) Determine the most likely identity of the substance based on the table in the problem statement. MultipleChoice : 1) Carbon tetrachloride 2) Diamond 3) Ethanol Sodium chloride 5) Plexiglass 6) Water, fresh 7) Glycerine 8) Polystyrene 9) Glass, crown 10) Glass, flintWhat is the density of water vapor in the air on a hot, dry day in the desert when the temperature is 40.0 °C and the relative humidity is 5.00 %? The vapor pressure of water at 40.0 °C is Py = 7.34 x 10° Pa and the molecular mass of water is M = 18.0 g/mol. Enter your answer in units of grams per cubic meter. density: g/m3
- Janice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. The change in elasticity of the steak on cooking is due partly to the loss of water volume (so that existing bonds get closer together) and partly to the creation of new bonds. Assume all of the difference in raw vs. cooked steak thickness is due to water loss that makes it thinner (25 mm thick in the uncooked steak, versus 15 mm thick in the cooked steak), and that the other dimensions of the steak (length and width) have not changed. By what percentage has the steak's volume decreased from the original value?…What is the ΔS° for the reaction? Given are the S°, in J K-1 mol-1, of each substance in parentheses. SiCl4 (g, 330.73) + 2 Mg (s, 32.68) → 2 MgCl2 (s, 89.62) + Si (s, 18.83) -198.02 J/K 198.02 J/K -254.96 J/K 254.96 J/KA container of gas holds 0.74 moles of neon gas. If the volume of the container is 11.8 liters and the pressure inside is 1.97 atm, what is the temperature (in K) of the gas?
- According to the Ideal Gas Law, PV = kT, where P is pressure, Vis volume, T is temperature (in Kelvins), and k is a constant of proportionality. A tank contains 2000 cubic inches of nitrogen at a pressure of 26 pounds per square inch and a temperature of 600 K. Determine the EXACT value of k.Janice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. Calculating elasticity What is the elasticity of the raw steak? Express your answer in Pascals but without including the units in your answer. What is the elasticity of the cooked steak? Express your answer in Pascals, but without including the units.the density of lead is 11.0 g/cc at 4°C. What is the density of lead in pounds per cubic feet at this temperature?