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A sample of H½O with a mass of 46.0 grams has a temperature of -58.0 àC. How many joules of energy are necessary to melt 46.0 grams of ice? (Use 2.1 J/gàC for the specific heat of ice, and 334.4 J/g for the heat of fusion of water.)
Suppose you have just added 200.0 ml of a solution containing 0.5000 moles of acetic acid per liter to 100.0 ml of 0.5000 M NaOH. What is the final pH? The Ka of acetic acid is 1.77 x 10^-5
if a diamond is made out of pure carbon and has a density of 3.52 gcm3 how large would a mole of carbon atoms in
A second 25.0 mL aliquot of the original solution was mixed with 20.0 mL of 50 ppm quinine solution before dilution to 100 mL. The fluorescence intensity of this solution was 425. Calculate the percent quinine in the tablet.
In the titration, 20.46 mL of the sodium hydroxide was used to react with 0.1082 grams of KHP. What is the molarity of the NaOH?
What are these types of electrons called? Show the valence electrons in a molecule of water, and tell which ones are which.
The reactant concentration in a zero-order reaction was 9.00×10-2M after 175 s and 4.00×10-2M after 325 s. What is the rate constant for this reaction?
Using the information below, what is the most stable form of sulfur at 298K and 1atm? (no calculations needed) S(rhomic): V=0.016, delta H formation=0, delta G formation=0, Standard molar S=31.8, standard molar Cp=22.64 S(monoclinic)
What is the composition in mole fractions of a solution that has a vapor pressure of 30. torr at 20°C? X C6H6 and X C7H8. What is the mole fraction of benzene in the vapor above the solution described in part (a)?
how many grams of vinegar are required to react completely with 25.0g of baking soda.
Calculate each of the following quantities for an ideal gas: a) The volume of gas, in liters, if 5.32 moles has a pressure of 3.72 atm at -72°C. b) The temperature (in C) of a gas containing 8.55 x 10-12 moles occupying 64 mL at 693 torr.
Calculate the van der waals correction terms to pressure and volume for Cl2 at STP. The values of the van der waals constants a and b are 6.49L^2-atm/mol^2 and 0.0562 L/mol,
Choose the answer which lists the atoms Pb, Ga, Ti, Br, and Sn in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell.
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