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A lead atom has a mass of 3.4*10-22g. How may lead atoms are in a cube of lead that has a volume of 2.00cm3 if the density of lead is 11.3g/cm3
25.0 ml of a hydrofluoric acid solution of unknown concentration is titrated with 0.200 M NaOH. After 20.0 mL of the base solution has been added, the ph in the titration flask is 3.00.
The reaction N2(g) + 3 H2(g) ? 2 NH3(g) is at equilibrium in a reaction chamber. If an experimenter injects a small amount of N2 into the chamber, what happens to the forward reaction rate at that m
Write a nuclear equation to describe the neutron induced fission of U-235 to form Xe-134 and Sr-100. Determine how many neutrons are produced in the reaction?
When 50ml of 0.500M HCl at 25C is added to 50ml of 0.500M NaOH at 25C in a coffee cup calorimeter, the temperature of the mixture rises to 28.2C. What is the heat of reaction per mole of acid?
A voltaic cell with Ni/Ni2+ and Co/Co2+ half-cells has the following initial concentrations: [Ni2+]=0.80 M; [Co2+]=0.20 M. What is the initial E cell? What is [Ni2+] when Ecell reaches 0.03 V? What
When Pcl5 solidifies it forms PCl4+ cations and PCl6- anions. According to valence bond theory, what hybrid orbitals are used by phosphorous in the PCl4+ cations?
At a height of about 150km, the atmospheric pressure is 3*10^-6 torr and the temp is 420K. What is the concentration of the atmosphere in molecules per milliliter at 150km?
Chromium (iii) hydroxide Cr(OH)3 is highly insoluble in distilled water but dissolves readily in either acidic or basic solution. Briefly explain why the compound can dissolve in acidic or in basic
What is the volume of CO2 is being produced for every metric ton (1*10^3 kg) of limestone (CaO) that the plant produces from CaCO3. Pressure is .966 atm and Temp is 875C
Radioactive gold-198 is used in the diagnosis of liver problems. The half life of this isotope is 2.7 days. If you begin with 5.6-mg sample of the isotope, how much of this sample remains after 5.0
Gold can be hammered into extremely thin sheets called gold leaf. If a 1.00-g piece of gold (density= 19.32 g/cm3) is hammered into a sheet measuring 8.0 x 5.0 ft, what is the average thickness of
In a 3.0-L vessel the following partial pressures are measured at equilibrium: N2: 0.380 atm; H2: 0.400 atm; NH3: 3.00 atm. Hydrogen is removed from the vessel until the partial pressure of nitrogen
A voltaic cell with Mn/Mn2+ and Cd/Cd+ half-cells has the following initial concentrations: [Mn2+]=0.090 M; [Cd2+]=0.060 M. What is the initial Ecell? What is Ecell when [Cd2+] reaches 0.0050 M? Wha
Carbonyl sulfide (COS) is a trace component in the atmosphere. One difficulty in studying chemical reactions of this molecule is that it spontaneously decomposes into carbon dioxide (CO2) and carbon
A 1.423 g sample of a weak monoprotic acid is titrated with a 0.1383 M solution of NaOH, a strong base. After 37.65 mL of the NaOH solution has been added the equivalence point for the titrati
Lactic acid (HC3H5O3, M = 90.1 g/mol) is a weak monoprotic acid, with Ka = 1.4 x 10-4 at T = 25.0 °C. Potassium lactate (KC3H5O3, M = 128.2 g/mol) is the potassium salt of the conjugate base of
IF the naturally occurring level of hydrogen-3 (half life=12.6 years) in fresh wines is 535 d min/L (decay events/minute per liter) what would the expected hydrogen-3 activity in a bottle of wine c
When 12.1g of the sugar sucrose (a non-electrolyte) are dissolved in exactly 800g of water, the solution has a freezing point of -0.082 degrees Celsius. what is the molar mass of sucrose? Kf of wat
Into an evacuated 30L vessel is placed 0.1mol of n-butane dissolved in 0.9mol of n-hexane. if the vessel and its contents are kept at 298K, what is the pressure and the vapor and liquid compositions
By looking at the formula one might conclude that CO would have a large dipole moment, wen in fact it has a very small one. Based on the electron arrangement and the formal charge distribution, exp
What is the molarity of a hydrocholric acid solution if 20.00 ml of HCL is required to neutrilize .424 of sodium carbonate (105.99 g/mol)
Nitric acid is a strong acid , ammonium hydroxide is a weak base, and ammonium nitrate is a soluable salt, What is the net ionic equation for the reaction below?
If 25.o mL of .100 M Ca(OH02 is titrated with .200M HNO3 what volume of nitric acid is required to neutrilize the base?
Suppose The Reaction Ca3(po4)+3h2o4 =3CaSo4+2h3po4 Is Carried Out Starting With 103 G Of Ca3(po4)2 ,75 G Of H2so4 .how Much Phosphoric Acid Will Be Produced?