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If an unknown crystalline organic compound has a heat of melting that is 8.605 kJ/mole and a melting point of 250.6 C, what is its change in wnthropy for the transition in kJ/K*mole?
Suppose that 1.419 g of impure barium hydroxide is dissolved in enough water to produce 213 mL of solution and that 40.4 mL of this solution is titrated to the stoichiometric point with 8.3 mL of 0.0696 M HCl(aq). What percentage of the impure sam..
The resulting solution is titrated to a starch endpoint with 34.81 mL of the thiosulfate solution. Calculate the concentration of the thiosulfate solution.
Fish produce glycerol to survive the freezing waters of the Arctic. Determine the degree to which the freezing point of blood and other biological fluids is lowered with the help of glycerol. What is the ideal concentration range of glycerol requi..
How many moles of HNO3 are present in 35.0 mL of a 4.50 M solution of nitric acid?
An unknown compound contains only C, H, and O. Combustion of 5.50 g of this compound prodced 11.0 g of CO2 and 4.50 g of H2O. What is the empirical formula of the unknown compound.
Calculate the heat of reaction for the same reaction where water is a gaseous product instead of a liquid.
If 4.10 mol calcium carbide (CaC2) reacts with an excess of water, how many moles of acetylene (C2H2) will be produced?
how many square meters of floor space are there in a room which has 225.0 square yard of floor space 1 m=39.37 in, 1 yard =36 in.
A flask contains 0.120 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
Assume that the specific heat of the solution is the same as that of pure water. Calculate delta(H) (in kJ/mol NH4NO3) for the solution proces.
What is the freezing point of a solution of 1.17 g of 1-naphthol, C10H8O, dissolved in 2.00 mL of benzene at 20°C? The density of benzene at 20°C is 0.876 g/mL. Kf for benzene is 5.12°C/m, and benzene's normal freezing point is 5.53°C.
The gaseous product of a reaction is collected in a 25.0-L container at 27 degrees C. The pressure in the container is 300.0 kPa and the gas has a mass of 96.0 g. How many moles of the gas are in the container.
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