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An aqueous solution made by dissolving 168 mg of an unknown compound (a nonelectrolyte) in enough water to make 500.0 mL of solution, develops an osmotic pressure of 5.22 torr at a temperature of 23.5 °C. What is the molecular weight of this unknown compound?
Water expands on freezing. Since water is the principle ingredient in soft drinks when the soft drink freezes it will rupture the can.
An odorous gas emitted by a hot spring was found to diffuse 2.92 times slower than helium. What is the molar mass of the emitted gas.
A solution contains 2.0x10-8 moles of H+ ion in 10.0 liters A.What is the pH? B. What is the [OH-] C. What is the pOH? D. Is the solution acidic or basic?
Write the defining expression for the conditional solubility product constant, Ksp'. Than For the Ca2+ and F- ions, write the mathematical relations defining activity of each ion in terms of its concentration and activity coefficient.
find out the molar mass of each of the given gases 1 2.16 grams of a gas that occupies 1.38l at 665 mmhg and 25 degree
Enthalpies are relative quantities measured as changes from some comparative states. The enthalpies of formation of elements in their standard states at 25 degrees celcius are taken to be zero by convention
What is the function of the sodium thiosulfate in studying the kinetics of the hydrogen peroxide-iodide reaction?
what volume of vinegar would be needed to react with 18.00 grams of baking soda? Assume the density of vinegar is the same as that of water.
Calculate the pH of a solution that is 0.20 M HOCl and 0.90 M KOCl. In order for this buffer to have pH=pKa, would you add HCl or NaOH?
At 35°C and 1.30 atm, the density of a gaseous hydrocarbon is 2.262 g/L. The hydrocarbon could be
How do we equilibrate a pipette with the solution we are measuring? Why should we equilibrate it with the soultion we are measuring with it
You are given a crushed sample that is a mixture of limestone (CaCo3), lime (CaO), and sand. The calcium carbonate, limestone, is the only material present in the material that will decompose when heated
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