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Calculate its molecular mass at 23.6 degrees C, 0.500 L of a solution which is having the 0.302 grams of an antibiotic has an osmotic pressure of 8.34 mmHg.
A sample of H2O is broken apart into O2 and H2 gas. Samples were collected over the water. The temperature is 22 degrees C. The external pressure was 760.0 mm Hg. The water level difference i
Explain how the type of reactions you observed in this experiment could be useful in there cycling of copper. The chemical conversion of one product into another useful product is the basis for recy
Suppose an aerosol container was filled with a gas at2.5 atm and 22 degree Celsius. Aerosol containers often carry the warning that they should not be heated.
Diborane, B2H6 (B) and methylethyl ether (A), form a compound that melts congruently at the 133 K. The system exhibits two eutectics, one at 25 mol per cent B and 123 K and a second at 90 mol per c
If there are 4.50×1010 atoms of zinc emitting light in the instrument flame at any given instant, the emission line used for zinc determinations in atomic emission spectroscopy is 2
Illustrate phase diagrams for the following types of systems. Label intersections and the regions of the diagrams, stating what materials are present and whether they are solid, liquid, or gas.
Methane burns in oxygen to form water and carbon dioxide. If 3.75 L of gaseous CH4 is burned in an open container at STP, what volume of oxygen is needed for complete combustion? Explai
Determine the total energy needed in calories to totally melt the 160g of this compound of its melting point of 30 degrees Celsius if the Delta Heat Fusion of Copper Sulfate (CuSO4) is 10 kg/mole.
A mixture if oxygen and cyclo propane gas is used as an anesthetic. Cycloprapane contains 14.3%H and 85.7% C by mass. At 50.0C and 0.984 atm pressure, 1.56 g cycloprapane has a volume of 1.00L. Det
Determine the pressure of this mixture of gases if 20.0g of 02 and 4.4 g of CO2 are placed in a 5.00 L container at 21C.
Limestone (CaCO3) is used to remove acidic pollutants from the smokestack flue gases. It is heated to form lime (CaO), which reacts with sulfur dioxide to form calcium sulfite.
Determine the activity coefficients for both species in a solution that is a) 0.040 M in FeSO4; b) 0.20 M in (NH4)2CrO4; c) 0.10M in FeCl3 and 0.20M in FeCl2; d) 0.10 M NaCl.
Explain how does the oxidation number change for the copper in step two? And is copper the reducing or oxidizing agent in this step?
Determine the electron configuration for the Ni2+ ion and the Sn2+ion? Determine the numbers of unpaired electrons does each have? How do you know?
Explain what volume of 0.075 M KMnO4 will be needed to titrate 0.4555 g of K3 [Fe(C2O4)3]? Molar mass of K3[Fe(C2O4)3]=437.21 g/mol.
Determine the normal boiling point of CCl4? Carbon tetrachloride, CCl4, has a vapor pressure of 213torr @ 40. C and 836 torr @ 80 C.
Determine the molar absorptive of X? Molecule X has an absorbance of 0.287 at 247 nm when a 7.67× 10-5 M solution is measured in a 2.25 cm cell.
A sample which is having 0.00062 g of benzene (C6H6) is dissolved in the 200.0 mL of water. The solution gives an absorbance of 0.102 at 227 nm using a 1.0 cm cell. A separate water sample containi
Determine the percent yield of aspirin when 2.978 g of acetylsalicylic acid were obtained from the 3.789 g of salicylic acid by reaction with excess the acetic anhydride.
The weight loss is due to the volatilization of CO2 (44.01 g/mol). A chemist is given a sample known to contain calcium carbonate, CaCO3. It is also known that CaCO3 (100.09 g/mol) is the only compo
Determine the heat of reaction for the same process at constant pressure as opposed to constant volume? The heat of formation of CO at 25o C was calculated in a bomb calorimeter to be -111,759 J
A sample of water which is having 361 g absorbs infrared the radiation at 1.06 x 104 nm from a carbon dioxide laser. Assume all the absorbed radiation is converted to heat. Determine the number
Determine the concentrations of CH3COO - and CH3COOH in a solution in which their total concentration is 0.380 mol/L and the pH is4.46. Explain how much does the pH change if 0.0200 mol of soli
Determine the entropy change for a particle in this system if the final number of microstates is 0.596 times that of the initial number of microstates?