A gas containing nitrogen, benzene, and toluene is in equilibrium with a liquid mixture of 30.0 mole% benzene–70.0 mole% toluene at 50.0°C and 15.0 atm. Estimate the gas-phase composition (mole fractions using Raoult's law).
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3. a. Classify the following minerals:CaZrO3, FeCr2O4, SrTiO3, ZnAl2O4; as spinels or perovskites. Show how you came to this classification.
b. Describe the important electrical and/or magnetic properties of spinels, perovskites and non-stoichiometric oxides. (Note: if you quote directly from the textbook or other source please use an appropriate citation).
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Question
25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.0 C is mixed with 35.0 mL of water (density = 1.0 g/mL) initially at 25.3 C in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?
please explain equation step by step I am confused and thank you in advance (my professor isn't helpful )
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EXPERIMENT #6 DETERMINATION OF THE CONCENTRATION OF TARTARIC ACID IN WINE
1. Why must the sodium hydroxide concentration be reported to four significant figures? Why not use only two significant figures?
2. In the procedure, you added approximately 15 mL of water to each Erlenmeyer flask. Why did the exact volume of water not matter? What impact would accidentally adding 17 mL of water have on the results? Be prepared to explain.
3. Explain the significance of the value for relative standard deviation in the context of this experiment.
4. Explain the significance of the value for percent error in the context of this experiment.
5. The stoichiometric ratio in this experiment is 1:2. Determine how the calculation set-ups would change for the reaction between:
HNO3 (aq) + NaOH (aq) = H2O (l) + NaNO3 (aq) OR
H3C5H5O6 (aq) + 3 NaOH (aq) = 3 H2O (l) + Na3C5H5O6 (aq)
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How many grams of silver are formed when 2.0 g of tin react with 15 mL of 1.0 M silver nitrate solution?
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CHROMATOGRAPHY
In running a TLC analysis of ferrocene and acetylferrocene, the two substances were analyzed on a TLC plate in 3 different solvents (1:1 petroleum ether/diethylether, and petroleum ether and diethylether, respectively). What would be some clues that the samples of ferrocene and acetylferrocene being used in this analysis were impure?
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A scientist measures the standard enthalpy change for the following
reaction to be -613.2 kJ :
P4O10(s) + 6
H2O(l)-->4H3PO4(aq)
Based on this value and the standard enthalpies of formation for
the other substances, the standard enthalpy of formation of
H3PO4(aq) is kJ/mol.
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How many milliliters of water vapor, H2O(g), measured at 318 oC and 735 torr, are formed when 33.6 mL of NH3 at 825 torr and 127 oC reacts with oxygen according to the following equation:
4NH3(g) + 3O2(g) --> 2N2(g) + 6H2O(g)
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1.50L reaction vessel was initially filled with 0.150moles of CO and 0.300moles of H2. After equilibrium is established, the vessel is found to contain 0.119moles of CO. What is the equilibrium constant for this reaction? The reaction is: CO(g) + 2H2(g) ↔ CH3OH(g)
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Description: Our solar system is very diverse when it comes to the gas composition on our planets. On Mercury, which has almost no atmosphere, the pressure is less than 10-14 bar. Venus on the other hand has a much more dense atmosphere than earth, with a pressure of 92 bar. Instructions: Write a response to the following prompt and then respond to your peers.
Would having different atmospheric pressures have an effect on the accuracy of gas laws? If so, which planets would be the most reliable and which would be the least?
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Balance the following oxidation reduction reaction under acidic conditions. Show your work. MnO4− + H2SO3→ SO4 2− + Mn2+
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What is the difference between the endpoint and stiochiometric point in a strong acid/base titration?
A) The endpoint is when the pH is exactly 7
B) The stoichiometric point is when the pH is exactly 7
C) The endpoint and the equivalence point are the same thing
D) None of these answers is correct
I want an explanation to why it is B.
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Iodine - 131 is used in medical imaging. Iodine - 131 has a half-life of 8days. How much Iodine - 131 remains in a patient's system after 1 month?
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Answer the following short answer questions.
A) What feature of a reaction would ensure that its rate would respond to a pressure jump?
B) Compare and contrast the pre-equilibrium and steady state approximations.
C) Explain the role of the salt-bridge in an electrochemical cell.
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|
Copper can be electroplated at the cathode of an electrolysis
cell by the half-reaction. |
Part A How much time would it take for 338 mgmg of copper to be plated at a current of 7.1 AA ? |
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