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A 0.996g sample of an unknown was dissolved in 10.7 g acetic acid. If the freezing point depression of the solution was 4.14°C, find the molar mass of the unknown. (The Freezing point of Acetic Acid is 16.6°C.)
Calculate the mass of silver chloride required to plate 225 mg of pure silver.
Differences in boiling points, Rationalize the difference in boiling point between the members of the following pairs of substances:
In the electrolysis of aqueous NaCl, how many liters of Cl2(g) (at STP) are generated by a current of 7.50 A for a period of 100. min.
evaporate more quickly: 55 mL of water in a beaker or 55 mLmof acetone in an identical beaker under identical conditions?
how to calculate the concentration of a standard solution and the concentration of KMnO4 the mass of sodium oxalate used was 0.8367g and then it was diluted down with 50ml water, and 20ml H2SO4 then 25 ml of that solution
Assuming the mixture has the same specific heat (4.184J/goC) and density (1.00 g/cm3) as water, calculate the heat (in J) transferred to the surroundings, qsurr.
The solid fuel in the booster stage of the space shuttle is a mixture of ammonium perchlorate and aluminum powder. On ignition, the reaction that takes place is 6 NH4ClO4(s) + 10 Al(s) ? 5 Al2O3(s) + 3 N2(g) + 6 HCl(g) + 9 H2O(g)
A certain substance has a heat of vaporization of 69.66 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.50 times higher than
The densities of ice and water at 0 C are 0.9168 and 0.9998 respectively. if delta h for the fusion process at atmospheric pressure is 0.625 what is delta u.
when electrons move from the fourth energy level to the second energy level, they emit visible light. explain why the light emitted when an electron makes this move in a sodium atom is a different color than the light emitted
Estrone is a female sex hormone that is known to contain 80.0% carbon, 8.2% hydrogen, and the remainder oxygen. If 793mL of estrone is found to have a mass of 4.97g at 0.90atm and 200oC, find the molecular formula for estrone.
How much heat is needed to vaporize 3.63 g of liquid oxygen if the molar heat of vaporization for oxygen is 1,629 cal/mole?
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