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1.250 g mass of standard aspirin is dissolved in approximately 20mL of 1 M NaOH. This solution is added to a 250-mL volumetric flask as well as diluted to the mark with DI water. Explain how many grams per mL of aspirin are in the resulting solution. Note a 250-mL volumetric flask has a precision of 0.01 mL as well as the amount of NaOH added has no bearing on the important figures in the final concentration).
a sample of argon gas has a volume of 765 ml at a pressure of 1.40 atm and a temperature of 144 degree c what is the
a piece of gold jewelry that weighs 9.35 g and has a volume of 0.654 cm3. the density of pure gold is 19.3 gcm3 and the
Calculate how much water must melt in order to reach exactly 0 degrees celsius at thermal equilibrium. b) Calculate the entropy changes for ice, liquid water and the total entropy change.
What is the balanced chemical reactions that takes place when h2o2, concentrated h2so4, and Cu(s) is placed in solution. One of the byproducts should be copper sulfate (CuSO4) and there is some gas evolution during the reaction.
A solution of hexane and heptane at 30 degrees C with hexane mole fraction 0.305 has a vapor pressure of 95.0 torr and a vapor-phase hexane mole fraction of 0.55. Find the vapor pressures of pure hexane and heptane at 30 degrees C. State any appro..
What is the partial pressure of N2(g) (in atm) in a container filled with 0.1 mol N2(g), 0.2 mol O2(g) and 0.35 mol CH4(g) when the total pressure in the container is 5.0 atm
Explain what are the possible manipulation errors that might contribute to the errors in results of obtaining a larger amount of NaCl than was present in the original sample
dissolved .31 grams of KHP in 25 ml of water and it required 15.5ml of NaOH to reach end of titration, how many moles of KHP were originally present before the addition of the NaOH?
Write the net ionic equations and calculate the enthalpy of neutralization for the net ionic equations:
HClO is a weak acid (Ka = 4.0 × 10-8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.031 M in NaClO
a 33.00 sample of an unknown solution is titrated with a 0.110 solution. the equivalence point is reached when 28.38 of
An equilibrium mixture of PCl5(g), PCl3(g), and Cl2(g) has partial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr, respectively. A quantity of Cl2(g) is injected into the mixture, and the total pressure jumps to 263.0 Torr.
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