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A) What is the pH of a 0.430 M ammonia solution? (Express your answer numerically to two decimal places.B) What is the percent ionization of ammonia at this concentration? (Express your answer numerically to three significant figures)
What is the pH of a buffer that consists of 0.20 M NaH2PO4 and 0.40 M Na2HPO4? Ka = 6.2 × 10-8
what mass of limestone is required to remove all the sulfur dioxide formed by the combustion of 7.2 104 kg of coal that is 0.33 mass % sulfur?
An automobile has a wavelength that is not measurable by human standards. If the car has a mass of 4000 lbs (1.81 x 103 kg) and travels at 60 miles/hr (26.8 m/s), calculate the wavelength of the car.
Two substances, A and B, initially at different temperatures, come into contact and reach thermal equilibrium. The mass of substance A is 6.34g and its initial temperature is 21.0?C.
A quantity of 85.0 mL of 0.900 M HCl is mixed with 85.0 mL of 0.900 M KOH in a constant-pressure calorimeter that has a heat capacity of 325 J/°C. If the initial temperature of both solutions are the same at 18.24°C
Name those that have a trisubstituted ring where the methyl gorups are oriented Ortho for 3 different isomers.
Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. N2(g)+3H2(g)-->2NH3(g) Assume 4 molecules of nitrogen and 9 molecules of hydrogen are present.
The enthalpy change for the reaction A + 2B ? 3C, can be determined using the following equations: (1) 2Z + C ? X ?H = 15 kJ(2) 2B + 3X ? 3Z ?H = 30 kJ(3) 6X ? A + 9Z ?H = 20 kJ
Magnesium has three isotopes, Mg-24, Mg-25, and Mg-26. The percentage abundance of each in order is 78.70%, 10.13%, 11.17%.
Ascorbic acid is a diprotic acid Ka1=8.0*10^-5 and Ka2= 1.6*10^-12. What is the pH of a .260 M solution of ascorbic acid
The isolated (S)-(-)-enantiomer was distilled in vacuum to give 1.5 g of pure amine. Calculate the yield of (S)-(-)-alpha-methylbenzylamine.
determined that each molecule of the unknown base could accept two protons. What is the molar mass of this unknown compound?
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