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What is the molality of a solution made by dissolving of (MM+180.2) into of water? Assume the density of water?
Calculate the amount of heat liberated (in kJ) from 421 g of mercury when it cools from 91.0°C to 11.0°C.
Boron has two naturally occurring isotopes, 10B (19.9%)and 11B (80.1%). Although the B2 moleculedoes not exist naturally on Earth, it has been produced in the laboratory and observed in stars. (a) How many differentB2 molecules are possible? (b) W..
A 20-g mass of argon occupies 15.0 l at a pressure of 25 kpa . find the volume of the argon when the pressure is increased to 530 kpa.
Write the balanced equation for the yeast using glucose to produce energy, ethanol and carbon dioxide.
At 25 °C and 765 Torr, carbon dioxide has a solubility of 0.0342 M in water. What is its solubility at 25 °C and 1470 Torr
When 2.05 moles of a monoatomic ideal gas is reversibly heated at constant volume from 25 degrees celcius to 45 degrees celcius the entropy change of the system
How many grams of F- should be added to give 1.6 ppm? Fluoride is provided by hydrogen hexafluosilicate, H_2SiF_6. How many grams of H_2SiF_6 contain this much F-?
Hydrocarbons containing halogens are very useful molecules in synthetic chemistry. Use tabulated thermodynamic data as needed to calculate
Disposable lighters burn butane (C4H10) and produce CO2 and H20. Balance the chemical equation for this combustion reaction and determine how many grams of CO2 are produced by burning 1.00 g of C4H10.
Calculate the percentage of pyridine ( C5H5N) that forms pyridinium ion, C5H5NH+ , in a 0.10 M aqueous solution of pyridine (Kb = 1.7x10-9).
Barium sulfate, , is used in medical imaging of the gastrointestinal tract because it is opaque to X rays. A barium sulfate solution, sometimes called a cocktail
Calculate the pH of a solution made by adding 16.0 g of sodium formate
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