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A buffer is prepared by dissolving 52.203g of HNO2 and 65.552g Mg(NO2)2 into water forming 2.5 L of solution. What is the pH of the buffer?
keep in mind: Mg(NO2)2 (s)--------->H30+ (aq) +NO2- (aq)
Consider all possible transitions from the initial state to the final state of the hydrogen atom described above. Calculate all possible values of the wavelength of the emitted radiation.
How many grams of Na2CO3 are present in 29.7 mL of a 31.0% Na2CO3 solution. The density of the solution is 1.09 g/mL.
Calculate the pH of a solution that is 0.25M pyridine, C5H5N and 0.75M in pyridinium bromide, C5NHBr. (Kb for C5H5N= 1.7 * 10^-9)
When a 2.691 g sample of the unknown organic compound is vaporized at 90.0(degrees)C and 708. mmHg it is found to occupy a volume of 1.00L.
Calculate the amount of heat energy (q) gained or lost when 180g of water is cooled from 65.0*C to 28.5*C. What is the sign of q for this calculation
Meaning, use and calculation of empirical formulas, In this introduction are given the explanation of how to find out an empirical formula if one has found out the chemical elements of an unknown substance and measured their ratio of masses
Will the volume of a gas decrease, increase, or remain unchanged for each of the following sets of changes? a) The pressure decreased from 4 atm to 1520 mm Hg, while the temperature is decreased from 250°C to 212°F. b) The pressure is increased fr..
a sample of 1.00 l of gas at ntp conditions contains 20 oxygen and 80 nitrogen. calculate the number of moles of each
Verify that this is a first order reaction by plotting 1n ([C2H40]/M versus time and determine the value of the rate constant.
the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 55.0 atm, what was the volume of the sample? Assume that the temperature was held constant.
when discussing water treatment we learned that high phosphate concentrations are often observed and it is a problem
During steel formation, why do the following reactions cause the temperature in the converter to increase?
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