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1. Suppose a student performed a similar experiment with a different ionic unknown. Given the data in the table below, what is the van 't Hoff factor of the unknown substance? Kf of water 1.86 °C/mfreezing point of pure water 0.0 °Cmolality of solution 0.512 mol/kg freezing point of solution-2.9 °C
2. Which of the compounds in the table below is most likely to be your unknown FP sample 2? Name of Compound Molar Mass (g/mol)calcium sulfate 136.14, glucose180.16, potassium hydrogen phthalate 204.22, sodium oxalate 134.00
3. How do I calculate the molar mass of an unknown sample that has a mass of 2.00g and when mixed with 10ml of water has a mass of 12.000g.
Calculate the molarity of a solution made by adding 39.9 mL of concentrated perchloric acid (70.5 % by mass, density 1.67 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 2000 mL of solution.
Hydrogen sulfide () is a common and troublesome pollutant in industrial wastewaters. One way to remove is to treat the water with chlorine
An impure sample of benzoic acid (C6H5COOH, 122.12g/mol) is titrated with 0.9855 M NaOH. A 3.412g sample requires 24.43ml of titrant to reach endpoint.
write net equations for the acid-base reactions that occur when the given aqueous solutions are mixed. Determine the value of the equilibrium constant. Use single arrows for the extensive reactions (K>1000) but double arrows otherwise.
Nitrogen monoxide and oxygen react to form nitrogen dioxide. Consider the mixture of NO and O2 shown in the accompanying diagram. The blue spheres represent N, and the red ones represent O.
Calculate the pH at the beginning of a titration of 50.00 of 0.005M HA (Ka=2.0*10^-2) with NaOH solution. If the quadratic equation is assumed to be accurate
Calculate the molar mass (in units of g/mol) of the solute . Kf of water is 1.86 C/m?
Assume the radius of a neutron to be approximately 1.0; times ;10^{ - 13} {rm cm}, and calculate the density of a neutron. [Hint: For a sphere V = (4/3)pi r^3.]
What data is collected in a titration? How would I be able to find what the volume of 0.10M HCl should be needed to titrate .136 g Na2CO3 according to the reaction equation:
Write an equation showing how this buffer neutralizes added acid HI. Write an equation showing how this buffer neutralizes added acid Ba(OH)2
The reaction is spontaneous in the forward direction. B. If Q = 1, then DGrxn = G°rxn. C. If G°rxn = 0, the reaction is spontaneous in the reverse direction. D. If G°rxn > 0, the reaction is spontaneous in the reverse direction. E. Under equilibri..
If 10.00 mL of 0.050 M KI solution is mixed with 40.0mL of other reagents what would be the the diluted concentration of KI
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