Explain the energy changes at the molecular level when
liquid acetone is conferred to vapor at it's boiling
point
In: Chemistry
When either cis- or trans- 2 bromocyclohexanol is reacted with HBr, only the trans- 1,2- dibromocyclohexane is formed. Explain.
In: Chemistry
Consider three gas connected gas containers as shown in the figure below.
Consider three gas connected gas containers as shown in the figure below.
CO2 (g) P = 2.13, V = 1.50L
H2(g) P = 0.861 atm, V = 1.00 L
Ar (g) p = 1.15atm, V = 2.00L
T = 298K
Assume, that you open the two stopcock so that the gases can flow freely.
Calculate the change of the chemical potential of the entire system due to mixing the gases.
Using the change of the chemical potential of gases show that the mixing of three gases is spontaneous
Determine the value of DmixH .
mix = ______________________
mixH = _____________________
In: Chemistry
The rate of a certain reaction was studied at various temperatures. The table shows temperature (T) and rate constant (k) data collected during the experiments. Plot the data to answer the questions.
What is the value of the activation energy, Ea , for this reaction?
| T (K) | k (s−1) |
|---|---|
| 400 | 0.000108 |
| 420 | 0.000626 |
| 440 | 0.00310 |
| 460 | 0.0134 |
| 480 | 0.0511 |
| 500 | 0.175 |
| 520 | 0.547 |
| 540 | 1.57 |
| 560 | 4.18 |
| 580 | 10.4 |
In: Chemistry
The mass of a lethal gas (HCN) is measured ot be 5.50 lbs. If this gas is incinerated in a high temperature oven with a volume of 750 cubic feet determine the temperature of the oven. Assume that the gas is at the same pressure as the atmosphere which is 755 Torr and the temperature of the gas is the same as the oven. (1 Cubic Ft = 28.3168466 Liters) (454 g= 1 lbs)
A) 2109K
B) 2778K
C) 3021K
D) 2505K
I got 2781K so my answers is off, im not sure what i did
wrong
In: Chemistry
Following dilution of a concentrated solution, the absorbance is determined to be 3.935 on our BioTek Plate Reader. What, if any, changes should be made to this experiment?
a The sample should be diluted at least two fold
b The sample should be concentrated 2 fold
c The sample should be diluted 100 fold
d The sample should be put into a different microplate.
e There is nothing wrong with this analysis and the 3.935 should be recorded.
In: Chemistry
List a solution that you have contact with. Choose one that has not been discussed by a classmate. Give the composition of the solution; specify the units used to express the concentration. What is the solute? What is the solvent? Tell what the solution is used for.
How about the solution for dish soap.
In: Chemistry
A mixture of propane and butane is burned with air. Partial analysis of the stack gas produces the following dry-basis volume percentages: 0.0527% C3H8, 0.0527% C4H10, 1.48% CO, and 7.12% CO2. The stack gas is at an absolute pressure of 780 mmHg and the dew point of the gas is 46.5 ˚C. Calculate the molar composition of the fuel.
In: Chemistry
compare these different methods for determining the concentration of copper(II): titration, quantitative precipitation, and spectroscopy and discuss the applicability (under what conditions would each be preferable) of each method.
In: Chemistry
Ammonium Nitrate+Potassium sulfide
a.Write the balance equation
b.Total ionic equation
c .Net equation
In: Chemistry
Determine the concentrations of the ionic species present in a 0.285 M solution of the HO2CCH2CO2H . (pKa1 = 2.83 , pKa2 = 5.69 ).
a) [ HO2CCH2CO2H ]
b) [ HO2CCH2CO2- ]
c)[ -O2CCH2CO2- ]
d) [H3O+]
e) [OH-]
In: Chemistry
For each of the following reactions, calculate ΔH∘rxn, ΔS∘rxn, ΔG∘rxn at 25 ∘C. State whether or not the reaction is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered from 25 ∘C?
a) 2CH4(g)→C2H6(g)+H2(g)
b) 2NH3(g)→N2H4(g)+H2(g)
c) N2(g)+O2(g)→2NO(g)
d) 2KClO3(s)→2KCl(s)+3O2(g)
Can you please show equations. I am having so much trouble with these.
In: Chemistry
Having trouble calculating the error of a diluted solution in a 100mL volumetric flask. Concentration is 0.005 +/- 0.005M Amount of Concentrated solution: 5.0mL +/- 0.1mL Volumetric flask: 100mL +/- 0.08mL
My calculation so far is ((0.1/5)+(0.005/0.005)+(0.08/100))*.00025 I keep getting 0.0002552 as my error but the answer key is 0.00003. Whats wrong in my formula?
In: Chemistry
You make two dilutions. You take 82.19 mL of the stock solution (8.1×10-5M) and dilute to 500.0 mL to make Solution #1. You then add 66.26 mL of Solution #1 to 30.11 mL of water to make Solution #2.
What is the concentration of the Solution #1 in terms of molarity?
What is the concentration of the Solution #2 in terms of molarity?
In: Chemistry
Explain why surface tension and viscosity decrease with increasing temperature.
Why do substances with high surface tensions also tend to have high viscosities?
In: Chemistry