Atomic bonding point of view
Pure aluminum is ductile metal withlow tensile strength and hardness. Its oxide Al2O3 (alumaina) is extremenly strong, hard, and brittle. Can you explain this difference from am atomic bonding point of view?
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Calculate the amount (mL) of Compound A needed to give 12 mmol. MW of Compound A: 32.04 g/mol Density of Compound A: 0.79 g/mL
Calculate the equilibrium concentration of NH3 and H2S if a sample of solid NH4HS is placed in a closed vessel and decomposes until equilibrium is reached.
A system of 118.0 moles of an ideal gas in 2.3 m3 has a molar internal energy of U = 25.0 kJ/mol at 1.3 bar. What is the molar enthalpy content of the ideal gas?
An acid with a Ka of 1 x 10-8 is titrated with NaOH, both solutions being 0.020 M. What should the Ka of the indicator be, in order to obtain the best end point
Calculate the change in pH when 4.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 4.00 mL of 0.100 M NaOH(aq) is added to the original buffer s
What is the pH of a buffer solution prepared by mixing 10.0 mL of 0.15 M ammonia and 15.0 mL of 0.20 M ammonium chloride?
Compute the momentum of a water molecule at normal conditions, assuming its kinetic energy (mv2 /2) is equal to (3kB T/2).
A 1.50 mole sample of an ideal gas is allowed to expand adiabatically and reversibly to twice its orignal volume. In the expansion the temperature dropped from 296ºK to 239ºK. Calculate ?E and ?H for the gas expansions
You need to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.200 M sodium benzoate. How much of each solution should be mixed to prepare this buffer
A vitamin C containin sample was titrated to the blue colored endpoint with 19 ml of 0.12 M iodine solution. How many grams of Vitamin C were in the sample
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