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We have an aqueous solution with a mass percent of 44.8 % for C2H5OH (C2H5OH is the only solute). The density of this solution is 0.950 g/mL. Calculate the molarity, molality, and mole fraction of C2H5OH in this aqueous solution.
how does direct current break apart water molecule? does the dc current fill the outer shell full of electrons making a
Elemental analysis is performed on an organic liquid with a fishy odor. Vaporization of 265.0 mg of the compound in a 110-mL bulb at 170°C gives a pressure of 440.0 torr. What is the molar mass of this compound
Show the structural formula and name of the first for homologous series of alkynes.
What is the amount of CO2 produced in the analysis, in moles?
A researcher studyng the nutritional value of a new candy places a 4.50 gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen
Water at 20 degrees Celsius flows through a 25 mm diameter pipe at a rate of 40 liters per minute. Is the flow turbulent, laminar, or can it be either? Explain why.
Problem- What is the Ea of a reaction in which a first rate constant and temperature are 0.000288 L/mol/s and 595K, and a second rate constant and temperature are 0.00194 L/mol/s and 695K
Radium-226 (atomic mass = 226.025402 amu) decays to radon-224 (a radioactive gas) with a half-life of 1.6x10^3 years. What volume of radon gas (at 25 C and 1 atm) is produced by 22 grams of radium in 4.5 days.
A 40.0 mg sample of a protein is dissolved in water to make 25.0 mL of solution. The osmotic pressure of the solution is 0.56 torr at 25°C. What is the molar mass of the protein?
Suppose it is a very hot summer day and you want to cool your kitchen. Unfortunately the windows and doors in your kitchen cannot be opened.
As a technician in a large pharmaceutical research firm, you need to produce 450. of 1.00 potassium phosphate buffer solution of = 7.38. The of is 7.21. You have the following supplies: 2.00 of 1.00 stock solution
When elements in the d-block are ionized, the electrons enter the nd orbitals before they enter the (n+1)s orbitals. Explain why this is so.
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