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You have 100 mL of toluene total and need the extraction to be 90% complete (only 10% remains in aqueous phase). Describe how this can be done.
Calcium carbonate reacts with hydrochloric acid to forma a salt, carbon dioxide and water. Write the balanced equation and determine how many grams of salt will be produced of 50g of calcium carbona
a chemist makes a solution of 1.33 Mol CaCl2 and 800 kg water, and then discovers that the freezing point of the solution is significantly less than 0 c how coudl teh chemist change the solution to
What is the theoretical yield of calcium carbonate if 2.05 grams of calcium chloride dihydrate reacts with excess sodium carbonate according to the balanced chemical reaction shown below?
The half-life for the reaction at 550 C is 81.3 seconds. How long does it take for 78.5% of a phosphine sample to decompose?
Provide the chemical reaction of an oxidation-reduction reaction that was observed to be spontaneous.Provide a value for the standard cell voltage for this reaction. Is the voltage a positive value
The half-lives were found to be 161 min at 199 degrees celcius and 12.5 min at 230 degrees celcius. Calculate the acivation energy for this reaction.
Starting with only the solid, it is found that at 40C the total gas pressure (NH3 and CO2) is 0.33 atm. Calculate the euilibrium constant Kp/
Then after ten to fifteen minutes it was noted that the pencil lead that was held by the red clip turned a black color and the pencil lead held by the black clip turned a red color. There was no cha
The complex ion [Co(CN)6]^-3 absorbs a photon of wavelength 2.90×10^2 nm. What is the splitting energy of this complex?
Then 2.00 mL of solution A is diluted with 8.00 mL of petroleum ether, forming solution B. How many grams of oleic acid are 5.00 mL of solution B?
22.3 g of a substance X dissolves in enough water to make 0.507 L of a 0.779 M solution. Calculate the molar mass of X in g/mol.
Neutrons are very important in the fission of uranium, the manufacture of the artificial isotope plutonium-239, and in the fission of plutonium-239. The function of the control rods and moderators i
Once the valve is opened, some oxygen gas flows from the first tank into the second tank until the gas occupies a new volume comprised by both tanks. The temperature remains unchanged. Determine the
The enthalpy change for melting ice at 0°C and constant atmospheric pressure is 6.01 kJ/mol. Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.39 mill
What is the formula for Tris(ethylenediamine)cobalt(III) pentacyanoiodomanganate(II)?
At a certain temperature, 0.200 moles of NO, 0.300 moles of Cl2, and 0.500 moles of ClNO were placed in a 25.0 L vessel and allowed to reach equilibrium:
Equation 1 never reaches equilibrium. Use this information and your knowledge of equilibrium to briefly explain why Equation 1 never reaches equilibrium.
An equilibrium mixture in a 2.00-L vessel is found to contain 0.0406 mol CH3OH, 0.170 mol CO, and 0.302 mol H2 at 500 K. What is Kp at this temperature?
A student immersed a 8.27g of unknown metal sample in a graduated cylinder containing 1ml of water. She noted the water level to rise to 23.4ml. from these data find the volume of the unknown metal
A solution formed by adding 33.0 g of furoic acid and 28.0 g of sodium furoate, NaC5H3O3, to enough water to form 0.210 L of solution
The solubility of oxygen gas in water at 25°C and 1.0 atm pressure is 0.041 g/L. What is the solubility of oxygen in water at 8.4 atm pressure?
A sample of gas has an initial volume of 13.8L at a pressure of 1.26 atm If the sample is compressed to a volume of 10.8L, what will its pressure be?
A 50.00-mL sample of 0.100 M KOH is titrated with 0.152 M HNO3. Calculate the pH of the solution after 52.00 mL of HNO3 is added.
How much natural gas will he need to burn? Natural gas produces 49.3 kJ of heat per gram. (For the sake of simplicity, assume that the transfer of heat is 100 % efficient.)