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An aqueous solution containing 34.5 g of an unknown molecular (nonelectrolyte) compoundin 156.5 g of water was found to have a freezing point of-1.3 C.
Calculate the molar mass of the unknown compound.(g/mol)
Which of the following elements would you predict to have an anomalous electron configuration? A) Se B) Ce C) Ag D) Sr
A stock solution of 1.24 x 10^-4 M dye is available in the lab. What volume of the stock solution must be transferred to a volumetric flask to prepare a 25.00 mL dilution with a concentration of 2.00 x 10^-5 M?
Calculate the voltage of the cell 2Ag+(aq) (0.200 M) + Cu(s) Cu2+(aq) (0.080 M) + 2Ag(s) Eocell = 0.460 V
you added 25 lambda of a mgml amino acid solution to 975 lambda of buffer. what is the concentration of the amino acid
Which of the following substances, when added to a saturated solution of AgCO3, will increase the solubility of AgCO3 in the solution?(select all that applies)
What is the pH of a solution containing 25 mL of 0.10 M acetic acid after 10 mL of 0.10 M NaOH is added
How many mL of 0.500 M stock acid and 0.250 M NaOH base solution must be used in preparation of this buffer? Check both answers.
Calculate the pH at the equivalence point in titrating 0.047 M solutions of each of the following with 0.011 M NaOH. (a) periodic acid (HIO4) pH = (b) benzoic acid (HC7H5O2), Ka = 6.3e-05 pH = (c) carbonic acid (H2CO3), Ka = 4.3e-07 pH =
If the standard enthalpy of combustion of octane, C8H18(l), at 298 K is -5471 kJ x mol-1, calculate the standard enthalpy of formation of octane. The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ x ..
If 4.21*10^-3 moles of Ca^2+ react with excess PO4^3- to form calcium phosphate, how many moles of the solid will form.
In the following conditions calculate the moles of hydrogen and the pressure in each flask where the volume is negligible. Each flask is originally 275K with .455 mols of hydrogen gas and .7atm of pressure. Then one flask is heated to 500K while t..
two 20.0 ml samples one 0.200 m koh and the other 0.200 m ch3nh2 were titrated with 0.100 m hi. what is the volume of
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