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Calculate the percent by mass of the solute ethanol in a solution produced by combining 2940 mL ofC2H5OH to of the solvent tetrahydrofuran. 4060 mL
A 32 mL sample of asolution of MgF2 was diluted with water to 70 mL. A 25mL sample of the dilute solution was found to contain 0.09 moles ofF-.
What is the known heat vaporization of water? How do you calculate the molar heat vaporization of water?
A cup of coffee cools down by transferring heat to the surroundings at a rate of 0.1kW (kilowatt). If the mass of coffeeis 0.2 kg and coffee can be modeled as water, determine the rate of change of
A 627 g sample of a solution of the soluteC6H6 in the solventC4H8O that has a concentration of is available. Calculate the of benzene that is present in the sample
What is th specific heat of a metal of the temperature of a 12.5-g sample increases from 19.50C to 33.60C when it absorbs 37.7 J of heat?
Vapor pressure of water at 25.0 degree C is 23.8 torr. Determine the mass of glocose (molar mass 180g/mol) needed to add to 500.0 g of water to change the vapor pressure to 23.4 torr.
Sophia Keller has been contacted by Foodlink to determine that the mass percent of acetic acid in their newest product, Vinagre deLite ,meets, but, does not exceed the industry standard of 5%acetic
The molecular weight of methotrexate, a pharmaceutical drug, is454.45. It is supplied in 1 mg per vial. You want to treat your culture cells with a final concentration of 1 nanoM methotrexateand wil
You need to prepare medium for your culture cells. Your salt solution is 10X concentration (commonly used laboratory stock solution), dilute to 1X for use. You also need to add fetal bovineserum for
Calculate the 95% confidence limits for there sult if it was based upon (a) a single analysis (b) the mean off our analyses,(c) the mean of 16 analyses.
Will mildly acidic conditions favour the formation of[Cu(NH3)4]2+(aq) fromCu(OH)2(s)? Use second equasion you wrote in(a) to explain reasoning.(d) Are these equilibrium reactions also redox rea
Limestone(CaCO3) is used to remove acidic pollutants from smoke stack flue gases. It is heated to form lime(CaO), which reacts with sulfur dioxide to form calcium sulfite.
A tank containing 20 kg of water at 20C fitted with a stirrer that delivers work to the water at the rate of 0.25kW. How long does it take for the temperature of the water to rise to 30 C if no heat
How many liters of hydrogen gas are collected over water at22°C and 725 mmHg when 0.86 g lithium reacts with water?Aqueous lithium hydroxide also forms.
When a pure sample of tert-butyl bromide isanalyzed by gas chromatography, 2 compnents are observed. one isthe tert-butyl bromide, and other is decomposition product.
Sodium hypochlorite (NaOCl) is the active ingredient in many aqueous commercial bleaching products. If the NaOCl added to aparticular sewage treatment process had a half-life of 15 days.
What is the total volume of gaseous products, measured at 383°Cand 757 torr, when an automobile engine burns 100. gC8H18 (a typical component of gasoline)?
In industry many productsare designed to be purified by recrystallization from water. What makes water such an attractive recrystallizing solvent, particularly when done on a large scale?
Three 45-g ice cubes at 0 C are dropped into 5.00x102 mLof tea to make iced tea. The tea was initially at 20.0 C: when thermal equilibrium was reached, the final temperature was 0 C.
The reducing level of nitrogen monoxide compounds emitted in automobile exhaust is a priority of environmentally concern edcitizens. One response to this has been the development of catalytic conver
The specific heat of zinc is 0.096cal/gC. Determine the energy required to raise the temperature of 250.0g of zonc from room temperature (24C) to 150.0C.
The characteristic odor of pineapple is due to acompound known as ethyl butyrate. Combustion of 2.78 mg ofethyl butyrate produces 6.32 mg CO2 and 2.58 mg H2O.
Which of the two functional groups present in p-aminophenol would react first with acetic anhydride and why? What is the function of water in this reaction?
Calculate the acetate ion concentration in a solution prepared bydissolving 8.90×10-3 mol of HCl(g) in 1.00 L of8.00×10-1 M aqueous acetic acid (Ka = 1.80×10-5).