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Assuming that 0.5 grams of a 1.0 gram sample is CaCO3, what should the concentration of HCl (M) be if you want to use 25.0 mL for the titration
The reaction for the decomposition of dinitrogen monoxide gas to form an oxygen radical is: N2O--->N2 + O2. If the activation energy is 250 kj/mol and the frequency factor is 8.0 x 10^11 s^-1, wh
The concentration of SO42- (aq) in a sample of river water can be determined using a precipitation titration in which a salt of Ba+ (aq) is the standard solution and BaSO4 (s) is the precipitate for
Will a precipitate form when a solution of sodium acetate and a solution of ammonium sulfate mix and what is the net ionic equation that describes the chemical change. what about for a solution of c
Calculate the empirical formula of the compound (CxHyOz). B) If the 4.00g sample corresponds to 0.0666 moles of a compound, what is the molecular formula of the unknown molecule (CxHyOz)
Thyroxine, an important hormone that controls the rate of metabolism in the body, can be isolated from the thyroid gland. If 0.455 g of thyroxine is dissolved in 10.0g of benzene, the freezing point
You need to make 50 agar plates. Each plate holds 30mls. Final agar consentration is 2.5%. How much agar powder do you need
The vapor pressure of water at 45.0 degrees celcius is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature
Gold has cubic crystals whose unit cell has an edge length of 407.9 pm. The density of the metal is 19.3 g/cm3. Calculate the number of gold atoms in a unit cell. What type of cubi lattice does gold
If 20.g of NaCl are used, how many grams of H2SO4 are required for complete reaction? Using the balance equation 2NaCl(s)+ 1H2SO4(aq)= 2HCl(aq)+ 1Na2SO4
Calculate the amount of acid that would be left in the water solution after four 20-mL extractions with ether. Do the same calculation, using one 80-mL extraction with ether, to determine which meth
the boyle temperature is the temperature at which the coefficient b is zero. Therefore, a real gas behaves like an ideal gas at this temperature. (a) Give a physical interpretation of this behavior.
Write a balanced molecular equation and a net ionic equation for the reaction aluminum hydroxide with a solution of hydrobromic acid. Include the states of each species. a) balanced molecular equati
Calculate the excluded volume for one mole of molecules, which is the constant b. How does this compare with the sum of the volumes of 1 mole of the same molecule
A reaction vessel contains 13.9g of CO and 13.9g of O2. How many grams of CO2 could be produced according to the following reaction. 2CO + O2 ---> 2CO2
A solution of 75.0 g of benzene (C6H6) and 75.0 g of toluene (C7H8) has a total vapor pressure of 80.9 mmHg at 303 K. Another solution of 100.0 g benzene and 50.0 g toluene has a total vapor pressur
What is the total molar concentration of all the ions in 0.030 M solutions of the following salts in water a) 0.030 M KCl = ________ M ions b) 0.030 M CuSO4 = _____ M ions c) 0.030 M CaCl2 = _______
The partial pressure of carbon dioxide is 675 mm Hg. If argon gas added to the mixture causes the total pressure to become 2410 torr, what is the partial pressure of argon? Report your answer in atm
For 2.25 moles of an ideal gas, Pext=P=200x10^3 Pa. The temperature is changed from 122 C to 28.5C and Cv=3R/2. Calculate the q, w, delta U and delta H for an isochloric process.
A human body contains 6 liters of blood. The hemoglobin content of blood is about 15.5g/100 mL of blood. The approximate hemoglobin molecular weight is 64,500g/mol. How many moles of hemoglobin are
In an adiabatic compression if one mole of an ideal gas with a Cv=5R/2, the temperature rises from 293 K to 325 K. Calculate the heat, work, change in enthalpy and change in internal energy
For each of the following states described in the following list, calculate the final pressure, as well as q, w, ?U, and H. a) the gas is expanded isothermally and reversibly until the volume double
At 25 °C and 765 Torr, carbon dioxide has a solubility of 0.0342 M in water. What is its solubility at 25 °C and 1470 Torr
What is the de Broglie wavelength in cm, of a 12.7 g hummingbird flying at 1.15 multiplied by 102 mph (1 mile = 1.61 km.)