Mima

carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction (delta Gf values: H2CO3= - 616.1, H2O= - 237.1, CO2= - 394.4) . Carbonic acid then ionizes in water (Ka1= 4.5 x 10^-7). Ignorin...

13 years ago

We had a Chemistry lab for buffer system, we used HCl and NAOH. We did a graph ( PH vs ml of HCL and NaOH, we told to estimate the buffer capacity using the graph. How to do this?

13 years ago

Our professor just told us that the final exam will be the ACS exam, we are taking general Chemistry II. What is the best way to study for ir? Is the preparing for ACS general chemistry study guide good? If we are taking general Chemistry II do we have to...

13 years ago

Why the addition of NH3 should be precise in spectrophotometer reading? What if it gives darker color?

13 years ago

carbon 14 has a half life of 5715 years. If you start with a 5 gram sample of 14C, what mass is left after 15,000 years?

13 years ago

A fossil is found to have a C-14 level of 86% compared to living organisms. How old is the fossil?, (the half life of C14 is 5730 years).

13 years ago

For the following fusion reaction, Calculate change in energy per mole.( Answer in J/mole) 2H1 + 2H1 ---> 3H1 + 1H1 (the mass number is in front of the atom and the atomic number is behind the atom) Given info:Atoms with their masses(amu) H-1 1.00782 H-2...

13 years ago

Calculate the cell potential for the following reaction as written at 79C given that [Zn^+2] = 0.819 M and [Ni^+2] = 0.014 M. Zn + Ni^+2 = Zn^+2 + Ni I know: E=E -RT/nF ln Q reduction potential for Ni= -0.26 reduction potential for Zn = -0.76 so E standar...

13 years ago

Neat pure ethanol C2H5OH has an enthalpy of vaporization of 39.3 Kj/mol, and a vapor pressure of 0.308 atm at 50 C. What is the boiling point, at atmospheric pressure of 1 atm, of a solution consisting of 35 G of phenol (a non-electrolyte hydrocarbon with...

13 years ago

A soccer ball is kicked from the ground with an initial speed of 14.5 m/s. After 0.272 seconds, ts speed is 12.4 m/s. (A) Give a strategy that will allow you to calculate the ball's initial direction of motion. (B) Use your strategy to find the initial di...

13 years ago

a block of mass m=0.9 kg is connected to a spring of force constant k= 775 N/m on a smooth horizontal surface. plot the potential energy of the spring from x= -5 cm to x= 5 cm. determine the turning points of the block if its speed at x= 0 is 1.2 m/s.

13 years ago

A 80.0 Hz generator with an rms voltage of 150 V is connected in series to a 3.20 k ohm resistor and a 3.50 micro farad capacitor. Find the phase angle between the current and the voltage.

12 years ago

Please please please help A single, standard cube is tossed. What is the probability of getting a number greater than 3

3 years ago

I did it in moles but still the homework assignment website is not accepting these answers. My work: Initial PH = 9.24. moles of NH3= 0.01 moles of NH4= 0.01 After addition of HCl: moles of HCl added= 0.0006 moles of NH3 left= 0.0094 moles of NH4= 0.0106...

13 years ago

Still wrong answer.

13 years ago

I got initial PH= 9.24 PH after HCl addition= 9.19 PH after NaOH addition= 9.3 so delta PH after HCl= 0.05 delta PH after NaOH= - 0.06 all these still wrong answers. could it be that I'm calculating the total volume wrong? should be 0.01+0.006 L?

13 years ago

You are right, thank you so so much. With addition of HCl, the Ph= -0.052. With addition of NAOH, the PH= 0.052. Thank you for all your efforts.

13 years ago

Thank you so much for replying, but I can't understand how to solve for partial pressure of CO2, when I get the [H^+] from PH then how to solve for partial pressure of CO2?

13 years ago

Thanks a lot, I got it.

13 years ago

Thanks, you mean finding n for acid or base? The graph represent only PH and volume we added for acid or base in ml.

13 years ago

Thank you for your reply.

13 years ago

Spectrophotometer. 2 ml of NH3 is added to Cu(NO3)2 to give it dark blue color. If we accidantely put 3 ml of NH3, would the absorbance reading by spec should be considered? Explain. I wrote we shouldn't consider the reading because it will give darker co...

13 years ago

Thank you so much.

13 years ago

I thought about that, but didn't know the initial and remaining N. Why initial N is 100?

13 years ago

The hint they gave us now is that this is a first intigrated order reaction, I do not get it, what the order of the reaction has to do with nuclear chemistry and decay?

13 years ago

Thanks, I got it right.

13 years ago

I'm getting 8.355E-22 Kg on for reactants, and 8.322E-22 Kg for products. I multiplied each mass they gave us in amu by 1.661E-27 to get it in Kg.

13 years ago

E= 0.438? I got the same answer (1.987) when I used the numbers you mentioned. Is the E standard potential = -0.26 -(-0.76)? Am I doing that right?(its cathode-Anode) right?

13 years ago

Got it, you are right, it's 0.439. Thank you so much, I was doing an easy math mistake (substracting before multiplying). Thanks again.

13 years ago

The answer is 285.4285714286

6 years ago

Im trusting you soup.

3 years ago

OMG SHE LIED BROOO I GOT LITERALLY 4/15.

3 years ago