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Calculate the [H3O+] and the pH for a buffer that consists of 0.13 M HF and 0.29 M KF. (Ka of HF = 6.8x10^-4)
2.0 moles of a nonelectrolyte solute are added to 1.0 kg of an unknown solvent. The freezing point is depressed by 7.9 K. Calculate the molal freezing point constant (Kf?) for this solvent.
How much heat (in kJ) is evolved in converting 1.00 {mol} of steam at 160.0C to ice at -45.0C? The heat capacity of steam is 2.01 J/g*C and of ice is 2.09 J/g*C.
In N2O, nitrogen is the central atom and the oxygen atom is terminal. In OF2, however, oxygen is the central atom.Use formal charges to explain why.
What volume and mass of steam at 100 degrees celsius and 760 torr would release the same amount of energy as heat during condensation as 65.5 cm(cubed) of liquid water would release during freezing?
you add 1.65L of water to 112g of sodium acetate. what is the molarity of the sodium acetate in the solution
If the ethane is burning at the rate of 0.20 mol/L.s, at what rate are CO2, and H2O being produced?
The pH in a lake the size of 4.0 km X 7.0 km and an average depth of 100 m is found to be 4.5. Calculate the mass of calcium carbonate that must be added to the lake water in order to raise its pH to 6.0.
Phosphorus, P, is combined with flourine F2, to give a gaseous compound with the formula PFx. If you start with 2.982 grams of P and isolate 12.129 grams of PFx, what is the value of x?
Identify the following systems as open, closed, or isolated. i) Coolant in a refrigerator coil ii) The combustion of liquid hexane in a bomb calorimeter
What volume in milliliters of a 0.5 solution of copper ll sulfate, CuSO4, is needed to react with an excess of aluminum to provide 11g of copper?
The enzyme, carbonic anhydrase, is a large zinc-containing protein with a molar mass of 3.00 × 104 g/mol. Zn is 0.218% by mass of the protein.
What volume would a 0.0236-mole sample of helium gas would occupy at a temperature of 24°C and a pressure of 0.750 atm?
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