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1.What is the effect of the following on the observed melting point of the compound: a) insoluble purity, such as charcoal; b) incomplete drying of the sample; c) less recrystallization solvent was used than it was needed?
2. Three test tubes, labeled X,Y, and Z, contain substances with approximately the same melting point. How could you prove that the three compounds are different?
A calorimeter contains 125 g of water at 26.1°C. A block of metal with a mass of 25 g is heated to 96.5°C and then placed in the water in the calorimeter.
Creat a spread sheet or matlab file with the following functionality: a/ The utility shoud use th P(in MPa) and T(in K) to calculate the ideal gas molar volume (in cm3/mol) at a reference state and two other states labeled ‘state1' and ‘state2'.
Compute ΔHo fusion and ΔSo fusion for this substance If the pressure is increased to 120 bar, the melting temperature increases to 375.88 K..
A zero-order reaction has a constant rate of 3.20×10-4 . If after 60.0 seconds the concentration has dropped to 6.50×10-2 , what was the initial concentration?
What is the freezing point (°C) of a solution prepared by dissolving 11.3 g ofCa(NO3)2 (formula weight= 164 g/mol) in 115 g of water? Assume that i=3.00 for Ca(NO3)2 and the molal freezing point depression constant for water is1.86°C/m.
How many grams of F2 are needed to produce 237 g of PF3 if the reaction has a 80.4% yield?
What molarity of aqueous aluminum sulfate solution can be expected to show the same conductivity
A sample of an unknown metal has a mass of 35.4 grams and a volume of 3.11 centimeter cube. calculate the density.
calculate the number of calories required of heat energy required for warming 39.8 grams of water from 19.9 degrees Celcius to 30 degrees Celcius.
The first ionization energy of bismuth is Ei1=+703 KJ/mole. What is the longest possible wavelenghth of light that could ionize an atom of bismuth?
How many grams of NaN3 are required to produce 11.0 ft3 of nitrogen gas if the gas has a density of 1.25 g/L?
calculate Kc for the reaction below: 2P(g)+ 5Cl2(g) 2PCl5(g) The answer provided is 240. Why is that?
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