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a student performs two melting-point determinations on a crystalline product. in one determination, the capillary tube contains a sample about 1-2 mm in height and the melting range is found to be 141 degree - 142 degree celsius. in the other determination, the sample height is 4-5 mm and the melting range is found to be 141 degree -145 degree. explain the broader melting-point range observed for the second sample. the reported melting point for the compound is 143 degree celsius.
Determine the amount of heat given off when 1.26 x 104 g of NO2 are produced express your answer (in kJ)?
A system absorbs 295 kJ of heat and the surroundings do 177 kJ of work on the system. What is the change in internal energy of the system?
which the Estandard cell potential is +.90 given that the Estandardreduction potential for sulfite is -.57V, calculate Estandard reduction for X.
A sample of water vapour at 200 degrees C is compressed isothermally from 350 cm^3 to 120 cm^3. What is the change in its molar Gibbs
Arrange the molecules in order of decreasing boiling point Molecules are methane, dimethyl ether
A student mixed 5.00 mL of a nickel(2) chloride solution with 5.00 mL of .100M sodium phosphate and a precipitate formed. How many moles of sodium phospahte were present in 5.00 mL of the solution?
Which of the following are a conjugate acid-base pair in the above reaction?
What volume of NaOH is needed to reach the end point of the titration? What was the initial concentration of HCl?
C3H8 + 5O2 reacts to yield 3CO2 + 4H2O +488 kJ What is the heat released if 2.5 moles of C3H8 reacts completely with oxygen?
Calculate the concentration of a red dye solution with an absorbance of 0.617. If you have 5.78ml of the solution how many mg of red dye are found in the solution.
Calculate the initial rate of the NO reduction at 1100 K if 400.00 mg of NO and 600.00 mg of H2 are confined to a 5.00 L reaction vessel.
The visual raw meat color was red(outside) and brown(inside) and when mixed with NaNO2 and NaNO3 the color changed to slight maroon and medium brown and pink.
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