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Mima
Questions and answers by visitors named
Mima
Questions (19)
For the following fusion reaction, Calculate change in energy per mole.( Answer in J/mole)
2H1 + 2H1 ---> 3H1 + 1H1 (the mass
5 answers
8,961 views
Calculate the change in PH when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in
3 answers
711 views
Calculate the change in PH when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in
10 answers
8,345 views
A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a
1 answer
626 views
A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a
2 answers
792 views
carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constanst (K) for this reaction
13 answers
8,555 views
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
3 answers
1,161 views
In the lab, as acid concentration got decreased, the Ka got increased. Why ?
1 answer
314 views
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
2 answers
586 views
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
6 answers
1,378 views
Why the addition of NH3 should be precise in spectrophotometer reading? What if it gives darker color?
4 answers
395 views
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?
3 answers
1,007 views
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
7 answers
3,120 views
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
5 answers
649 views
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
3 answers
788 views
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
2 answers
553 views
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
2 answers
567 views
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
3 answers
558 views
Please please please help
A single, standard cube is tossed. What is the probability of getting a number greater than 3
1 answer
187 views
Answers (19)
OMG SHE LIED BROOO I GOT LITERALLY 4/15.
Im trusting you soup.
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.
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?
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.
Thanks, I got it right.
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?
I thought about that, but didn't know the initial and remaining N. Why initial N is 100?
Thank you so much.
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
Thank you for your reply.
Thanks, you mean finding n for acid or base? The graph represent only PH and volume we added for acid or base in ml.
Thanks a lot, I got it.
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?
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.
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?
Still wrong answer.
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
