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In water open to the atmosphere (CO2 = 390 ppmv), at what pH must the water be buffered so that the carbonate concentration is twice the bicarbonate concentration?
a solution is prepared by dissolving 20.2 ml of methanol in 100 ml of water. the final volume of the solution is 118
A reaction has a rate constant of 0.0867 sec-1, how much of the compound (in mol/L) is left after 0.545 min, if there was 0.528 mol/L at the start
For the formation of your photchromic imine you use ammonium bromide. Give 2 reasons why you cannot use concentrated HBr.
Calculate the change in internal energy(Delta E) for a system that is giving off 65.0 kJ of heat and is performing 975 J of work on the surroundings.
the specific heat of ethylene glycol is 2.42 J/g-K. How many J of heat are needed to raise the temperature of 62.0 g of ethylene glycol from 13.1 C to 40.5 C ?
Starting with 2-methyl-3-hexanone, show the complete mechanism for the acid-catalyzed formation of the imine using propylamine (Pr-NH2.)
Explain how you arrived at this conclusions. Write a balance chemical equation for the reaction that occurs when sodium cyanide dissolves in water.
Given that the vapor pressure of pure n-hexane and pure h-heptane at 25 °C are 151.4 mmHg and 45.62 mmHg respectively, calculate the total vapor pressure above a solution containing only n-hexane and n-heptane in which the mole fractio n of n-hexa..
Use the following data to calculate the equilibrium constant K for the following reaction at 78?C: 2Br?(aq)+Cl2(g)?Br2(l)+2Cl?(aq) You may assume that ?H? and ?S? are independent of temperature.
The half-life for a first order reaction at 550 oC is 85 sec. How long it would take for 23% of the reactant to decompose?
A 64 g piece of ice at 0 degrees celsius is added to a sample of water at 9 degrees celsius. all of the ice melts and the temperature of the water decreases to 0 degrees celsius. How many grams of water were in the sample?
In a thermite reaction, powdered aluminum reacts with iron (III) oxide to make aluminum oxide and molten iron What mass of aluminum oxide is produced when 2.3 grams of aluminum reacts with iron (III) oxide
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