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Calculate the pH of a solution made up from 2.2 g of potassium hydroxide dissolved in 126 mL of 0.23 M perchloric acid. Assume the change in volume due to adding potassium hydroxide is negligible.
The enthalpy change for the reaction below at 25oC is -1,850 kJ (per mole of C9H20). What is the internal energy change for the reaction at 25oC
Write structures for all the structural isomers of double-bonded compounds with the molecular formula C5H10. Of the compounds
Write a balanced thermochemical equation for the standard formation of CH3OH
20 millilitres of H2SO4 solution was titrated against 0.2M NaOH and required 12.4 millilitres to reach the end point. calculate the concentration of the H2SO4 solution in (a)Molarity (b) g/l.
Explain for which of the following species resonance is an important property: HONO, HONO2, N3-, NO2-, NO2.
A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q. Is Q larger or smaller than the Ksp? Is the solution unsaturated, saturated, or supersaturated?..
Why should reflux of the microscale reaction mixture be gentle, with the condensation ring remaining close to the surface of the liquid in the test tube.
What is the minimum pressure in kPa that must be applied at 25 °C to obtain pure water by reverse osmosis from water that is 0.154 M in sodium chloride and 0.030 M in magnesium sulfate? Assume complete dissociation for electrolytes.
What is the total number of moles of Ca needed to react completely with 4.0 moles of H2O?
Determine the molarity of a solution of twenty grams of Ammonium bromide, NH4Br, in enough water to produce 132 mL of solution?
Draw the structure of the organic product formed in the reaction of m - cresol with sodium hydroxide
the barometer at an indoor pool reads 105 kpa. if the temperature in the room is 30 degrees Celsius, what is the pressure of the air
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