At 700 K acetaldehyde decomposes in the gas phase to methane and
carbon monoxide. The reaction
isCH3CHO(g)?CH4(g)+CO(g)
A sample of CH3CHO is heated to 700 K and the pressure is measured
as 0.20 atm before any reaction takes place. The kinetics of the
reaction are then followed by measurements of total pressure and
these data are obtained:
| t(s) | 0 | 1000 | 3000 | 7000 |
| PTotal (atm) | 0.20 | 0.22 | 0.24 | 0.28 |
Rate law --> Rate=??PCH3CHO?t=4.510?4atm?1?s?1PCH3CHO2
Find total pressure after 1.17104s
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An unknown pollutant gas has contaminated one of your samples of Ne(g). You test your Ne sample, at constant T and P and find that it effuses through a balloon 3.87 times more rapidly than a pollutant. What is the molar mass of the pollutant gas?
In: Chemistry
Question 1) What affect would switching from a lipophilic to a hydrophilic solvent have on the overall rate of an SN1 reaction mechanism? Explain your answer.
Question 2) What affect would switching from a hydrophilic to a lipophilic solvent have on the overall rate of an SN2 reaction mechanism? Explain your answer.
3 MARK QUESTIONS EACH
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Write the instruction of combined topic of Ligand Exchange in Cobalt Complexes,Quantitative Characterisation of Complexes And Visible Spectroscopy - The Spectrochemical Series
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1. Calculate the molarity of a solution made by adding 20.8 mL of concentrated potassium hydroxide (34.5 % by mass, density 1.46 g/mL) to some water in a volumetric flask, then adding water to the mark to make exactly 500 mL of solution. (It is important to add concentrated acid or base to water, rather than the other way, to minimize splashing and maximize safety.)
[KOH]= _________ M
2. A 0.450-gram sample of impure CaCO3(s) is dissolved in 50.0 mL of 0.150 M HCl(aq). The equation for the reaction is CaCO3(s) + 2HCl(aq) ---> CaCl2(aq) + H2O(l) + CO2(g)
The excess HCl(aq) is titrated by 9.10 mL of 0.125 M NaOH(aq). Calculate the mass percentage of CaCO3(s) in the sample.
__________ %
In: Chemistry
1. Converting pH=2.54 to hydrogen ion concentration, [H+].
2. What is the pH of a 7.93×10-4 molar solution of a strong acid?
3. If the pH of a solution of a strong base is 8.75, what is its hydroxyl ion concentration? What is its hydrogen ion concentration?
4. What is the pH of 37.9 mM solution of HNO3? What is its pOH?
5. Concert the hydroxyl ion concentration, 9.15 mM to pH
6. A 0.017M solution of HCL is mixed with a 0.017M solution of NaOH. What is the pH of the final mixture?
7. The pOH a drug solution is 6.82; what is the pH of the solution? What is the hydroxyl ion concentration is the solution is a strong base?
I need help with these 7 questions!
In: Chemistry
Show that 15M acid is approximately 90% acetic acid and 10% water by weight?
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How many calcium atoms are in 33.8g of calcium?
In: Chemistry
The apparatus below contains ammonia, neon, and hydrogen
chloride gases at a temperature
of 27ºC. The valve in the center is opened and the ammonia reacts
with the hydrogen chloride:
NH3(g) + HCl(g) → NH4Cl(s)
Neon does not react.
a) What mass of ammonium chloride will be formed?
b) What will be the total pressure in the apparatus after the
reaction is complete,
assuming the temperature remains constant?
|volume = 635 mL valve
NH3 pressure = 0.875 atm
Ne pressure = 0.893 atmvolume = 429 mL
HCl pressure =
1.613 atm
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What intermolecular force(s) is/are present in acetone that it would be a liquid at room temperature? Is there more than one force? If yes, which is stronger and which is weaker?
In: Chemistry
1- a. What mass of nitrogen has the same volume as 15.00 grams of hydrogen at -25oC and .750atm?
b. What is the density of an unknown gas at 258 K and 1.500 atm whose molar mass is 126 g/mole.
(Please type the answers, don't write them down on a paper)
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Brass is a substitutional alloy consisting of a solution of copper and zinc. A particular sample of red brass consisting of 80.0% Cu and 20.0% Znby mass has a density of 8760kg/m3 .
What is the molality of Zn in the solid solution?
What is the molarity of Zn in the solution?
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Find the pH during the titration of 20.00 mL of 0.1630 M benzoic acid, C6H5COOH (Ka = 6.3 ? 10-5), with 0.1630 M NaOH solution after the following additions of titrant.
(a) 0 ml
(b) 10.00 mL
(c) 15.00 mL
(d) 19.00 mL
(e) 19.95 mL
(f) 20.00 mL
(g) 20.05 mL
(h) 25.00 mL
In: Chemistry
Zinc sulfide, ZnS, exists in two main crystal forms. The more stable form, zinc blende, is face-centered cubic with tetrahedral coordination geometry and has density of 4.09 g/cm3. Use 184 pm for the ionic radius of S2- to calculate the ionic radius of Zn2+.
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Starting with a 30% (w/w) solution of hydrogen peroxide, how many mL would you need to dilute in order to end up with 25.00mL of a 3.6 M hydrogen peroxide solution? What are the hazards and safety precautions associated with 30% hydrogen peroxide. Assume a solution density of 1.11 g/mL.
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