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The isotope 22Na has a half life of 2.60 years. How much of a 1.00 gram sample would be left after 1.00 yr?
Which of the following chemical equations corresponds to the standard molar enthalpy of formation of N2O
Calculate ΔG for the reaction if the partial pressures of the initial mixture are PPCl5 = 0.0029 atm, PPCl3 = 0.27 atm, and PCl2 = 0.40 atm PCl5(g)--> PCl3(g) + Cl2(g)
a1.15 g sample of dry ice is added to a 765 ml flask containing nitrogen gas at a temperature of 25.0 c and a pressure
200 ml of 1.00m naoh is reacted with 200 ml of 1.00 m hcl in a calorimeter. the calorimeter and the solutions were at
This is maintained by a number of buffers, such as the carbonic acid/bicarbonate system. Write out the acid-base reaction and state qualitatively how this buffer solution resists changes in pH. Given the Ka of carbonic acid, H2CO3 is 4.5 x 10-7.
If the water in your well has 1000.0 mg/L of calcium carbonate dissolved in it, How many grams of sodium oxalate could you mix with 100.0 mL of that water before a precipitate would form
What is the concentration (in M) of the chloride ion when 16.2 mL of a 0.542 M solution of barium chloride is combined with 18.4 mL of a 0.619 M solution of aluminum chloride? Assume the volumes are additive.
Formic acid (HCOOH) is secreted by ants. Calculate [H3O+] for a 7.40E-3 M aqueous solution of formic acid (Ka = 1.80E-4).
A star is 3.28 x 1014 km from Earth. How many days does it take for light to travel from the star to Earth?
Aldol condensation: why must aldehyde contain none of corresponding acid? In the aldol condensation with benzaldehyde + acetone (NaOH, ethanol) --> dibenzalacetone
Some of the original solid remained and total pressure in container was 7.76 atms when equilibrium is reached. Calculate number of moles of H2O(g) present at equilibrium How many grams of original solid remain
The rate constant of a reaction is 7.50*10-5 L/mol·s at 195°C and 5.30*10-3 L/mol·s at 258°C. What is the activation energy of the reaction, in kJ/mol
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