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  1. Expectation value= -30 *0.25 -20*0.05-10*0.25...

    Expectation value= -30 *0.25 -20*0.05-10*0.25 +0*0.20 +10*0.25 = -8.5

    Variance can be calculated as = (-30 + 8.5)^2*0.25 + (-20+8.5)^2 * 0.05 .

    I'll leave that to you to calculate !
  2. Question: Wave laws?

    by joinforfun8909
    Answers
    4
    Views
    1,630

    To add "matter waves" to the list :) [De Broglie...

    To add "matter waves" to the list :) [De Broglie Relation]
    wavelength = Planck's constant / Momentum
  3. 1.25 g is not mass of MgCO3. It is the mass of...

    1.25 g is not mass of MgCO3. It is the mass of MgCO3 with impurities. So the task is to find the mass of MgCO3 actually present.

    That can be done by using the number of moles of HCl consumed...
  4. Answers
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    428

    Phosphoric acid has 3 acidic protons and you can...

    Phosphoric acid has 3 acidic protons and you can think of them being replaced one by one. Infojunkie's answer is correct !
  5. They look fine.

    They look fine.
  6. If you see the answer I gave for your previous...

    If you see the answer I gave for your previous question, you'll understand how to solve this one.

    Are these homework questions ?
    There is a different place for them.
  7. Molecular weight of NH3 = 14 + 3 = 17 g/mol....

    Molecular weight of NH3 = 14 + 3 = 17 g/mol.
    moles = 17 g/ 17(g/mol) = 1 mol.

    Molarity = moles / volume = 1/0.5 L = 2 M
  8. Answers
    1
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    1,168

    NaF is a strong electrolyte. So assume that its...

    NaF is a strong electrolyte. So assume that its dissocation goes to completion and you'll have [F-]= 1 M.

    The equlibrium equation is
    HF <-> H+ + F-
    I 1.0 0 1.0
    C -x x ...
  9. Answers
    4
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    1,047

    Based on your numbers alone it may be hard to...

    Based on your numbers alone it may be hard to figure out the freezing point correctly. Did you observe changes in the solution ? First appearance of cloudiness [that's basically parts of the solution...
  10. Thanks a lot for your advice.

    Thanks a lot for your advice.
  11. Answers
    2
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    11,322

    Sounds correct. Just compare the structure with...

    Sounds correct. Just compare the structure with NH3. It should work out similarly.
  12. US Resident Alien on F-1, wife on F-2 [has ITIN].Does she need ITIN ?

    Hi
    I am an Indian citizen on F-1 in the US for the past 6 years. This year my status has changed to Resident Alien for Tax purpose. My wife is on F-2 and last year we filed 1040NR as married and...
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