Recalculate the percent dissociation of 0.19M HN3 in the presence of 0.19M HCl.

A 150.0 mL gas tank contains 51.2 g of oxygen gas and 32.6 g helium gas. What is the total pressure in the tank? What is the partial pressure of oxygen?

Which statement about the following redox reaction in acidic solution is not correct?

MnO₄^??(aq) + I?^??(aq) ? MnO₂(s) + I₂(aq)

The energy from condensing water vapor is used to melt ice at 0oC. What mass (kg) of ice can be melted by condensing 0.500 kg of water vapor? (ΔHfus = 6.01 kJ/mol and ΔHvap = 40.7 kJ/mol)

) The standard enthalpies of formation of SO2 and SO3 are ?297 and ?396 kJ/mol respectively. Calculate the standard enthalpy of reaction for the reaction:   SO2(g)  + 1/2O2(g)??SO3 (g)

Choose 3 journal articles you think will be useful as references for your formal lab report paper. You may use review articles or research articles. You might try typing in a keyword for your topic and the word “review”.   Obtain copies either from the library or from an on-line resource. In the space provided below, explain in no more than 5 sentences per article why you feel the article you have selected is appropriate for your paper. Just because your key word appears in the title does not automatically mean the paper will be useful for your report. Briefly state how you will use it in your report. Attach a copy of each article to the assignment before handing it in. Directions on how to access electronic journals through the University of Houston Library are at the end of this document. If you cannot download an article you desire directly from the PubMed website, try through the University of Houston Library electronic journals collection. If the university does not have the electronic version on file, you will have to go to the library and copy it on a copy machine (the old-fashioned way). If you cannot obtain a copy of the article, you can place a request through interlibrary loan at the service desk at the library or you will need to find another article.

in Crystallography

you can chose any subject you want :)

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:

Rate law --> Rate=??PCH3CHO?t=4.510?4atm?1?s?1PCH3CHO2

Find total pressure after 1.1710⁴s

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?

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

Write the instruction of combined topic of Ligand Exchange in Cobalt Complexes,Quantitative Characterisation of Complexes And Visible Spectroscopy - The Spectrochemical Series

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.

__________ %

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!

Show that 15M acid is approximately 90% acetic acid and 10% water by weight?

How many calcium atoms are in 33.8g of calcium?

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