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A 498 mL sample of laughing gas, N2O, is at 30 oC and 414 torr pressure. (a) How many gas molecules are present? (b) How many atoms are there
A sample of diatomic gas has a density of 0.002061 g/mL at 1.8 atm pressure and 25.0 °C. Identify the gas.
The pH of a 0.10 M nicotinic acid solution is 2.93. What is the approximate value of Ka for nicotinic acid, HC6H4NO2? Assume small percent dissociation
It takes 151 kj/mol to break an iodine-iodine single bond. Calculate the maximum wavelength of light for which an iodine-iodine single bond could be broken by absorbing a single photon.
The pH of a 0.10 M nicotinic acid solution is 2.93. What is the approximate value of Ka for nicotinic acid, HC6H4NO2? Assume small percent dissociation. pH = ?log10[H+].
Explain the effect of the following experimental errors on your results: a) You add hexane to the reaction flask instead of 1-hexene b) You use 3% hydrogen peroxide instead of 30% c) You forget to a
A gas mixture containing 80.0 mol% N2 and the remainder n-heptane flows through a pipe at a rate of 10.0 m3/h. The pressure is 0.90 atm and the temperature is 100°C. a. What is the molar flow ra
Use the Gibbs phase rule to find the degrees of freedom for the following systems at equilibrium: a. Liquid water in equilibrium with water vapor. b. Liquid water in equilibrium with humid air.
Diethylamine, (C2H5)2NH, is a weak base (pKb=3.16 at 25oC). What is the pH of 0.155 mol/L (C2H5)2NH(aq) at 25oC? Give your answer accurate to two decimal places.
Given that the ionizable H atoms are associated with carboxyl groups, draw a plausible structure for maleic acid.
What is the approximate percent of complexed iron in a 0.1 M Fe3+ solution containing 1 M KSCN? Kf FeSCN2+ = 1.2*10^2
Use values of Ksp and Kf for copper (II) hydroxide and its complex to predict if a precipitate should form in a 0.1 M Cu2+ solution that is 3 M OH-. Ksp Cu(OH)2 = 1.3*10^-20 and Kf Cu(OH)42- = 1.3*1
Calculate the equlibrium concentration of Ni2+ in a solution with an analytical Ni(EDTA)2- concentration of 0.0125 at pH 8.0.
Calculate the rms veloctiy of each gas at this temperature. b) Calculate the average kinetic energy per mole and per molecule for each gas.
Calculate the expected pH of 0.05 M HAc, 0.05 M Ac-, and 0.05 M HAc/0.05 M Ac- after the addition of 1 mL 1.0 M NaOH to each.
Saturated Calomel Electrode || Titration Solution | Ag (s) Calomel Electrode: E=0.241V For Ag+ + e- ---> Ag(s), E0 = 0.79993 V. AgI is Ksp = 8.3 × 10-17. What it the volts at equivalence po
Calculate the concentration of Ni2+ in a solution that was prepared by mixing 50.0 mL of 0.020 M Ni2+ with 50.0 mL of 0.0300 M EDTA. The mixture is buffered at a pH of 3.0.
Iron pyrite, commonly known as "fool's gold," is 46.5% Fe and 53.5% S. A crystal of iron pyrite contains 4.24g of iron. A) Calculate the mass in grams of the crystal. B) How many moles of iron is in
Select all of the following that would be acceptable conjugate acid-base pairs to use in the preparation of a pH=9.8 buffer.
The Ka of lactic acid, HC3H5O3, is 1.410?4. (a) Suppose buffer #1 is prepared using 40.0 mL 0.1 M HC3H5O3 and 60.0 mL 0.1 M C3H5O3- to give a final volume of 100.0 mL. What is the pH of this buffer
Would this reaction be an example of saponification? phenyl-COOCH2CH3 + NaOH ----> phenyl-COONa + CH3CH2OH I ruled out Aldol condensation and enolization
When chromium crystallizes, it forms body-centered cubic cells. The unit cell edge length is 288.7 pm. Calculate the density of chromium
The pressure inside a hydrogen-filled container was 2.10 at 21 . What would the pressure be if the container was heated to 90
Diethylamine, (C2H5)2NH, is a weak base (pKb=3.16 at 25oC). What is the pH of 0.155 mol/L (C2H5)2NH(aq) at 25oC
Calculate the pH of a buffer solution that is 0.250 M in HCN and 0.170 M in KCN. For HCN, Ka = 4.9 x 10^-10 (pka = 9.31). Use the equilibirum approach to calculate this pH