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  1. K

    Help on empirical formula

    Vitamin B5 is called niacin or nicotinic acid. Its percentage composition by mass is (58.4% Carbon) (4.09% Hydrogen) (25.99% Oxygen) and (11.38% Nitrogen). What is the empirical formula of vitamin B5?
  2. K

    Organic Compounds Structural Formula

    when drawing the structural formula for 2-methylbutane or 2,3-dichloro-2-methylbutane,does it matter which end of the chain i begin counting from?
  3. K

    Period 3 ionization energy

    thankyou
  4. K

    Period 3 ionization energy

    i am stuck on this question and people are giving me different answers. Ok which period 3 element has the following succesive ionization energies: 1800,3000,3600,5800,13200
  5. K

    Succesive Ionization Energies

    The succesive ionization energies in kj/mol of an element x found in period 3 of the periodic table are: 1800,3000,3600,5800,13200. With the aid of a periodic table,what is element x?
  6. K

    Electronic configuration

    Galium has 3 positive ions. So i guess Nitrogen have 3 negative ions and therefore gaining 3 electrons.
  7. K

    Electronic configuration

    here is my problem. Galium Nitride is an Ionic Compound. Work out the electron arrangement of the Nitrogen ion
  8. K

    Concenctration of a mass

    0.0005mol/dm3
  9. K

    Concenctration of a mass

    M is concentration. There are two ways of writing it,M or mol/dm3
  10. K

    Concenctration of a mass

    Concentration=moles/volume Moles = mass/atomic mass, 5.8g/Na2C03 So 5.8/106=0.005moles. Conc=0.05/100=0.0005M. So?
  11. K

    Concenctration of a mass

    I found concentration to be 0.0005M. Could you confirm if this is correct?
  12. K

    Concenctration of a mass

    Mass of Na2CO3 is 5.8g
  13. K

    Concenctration of a mass

    Hi guys,here is my question. What is the Concentration of Na2CO3 when it dissolves in a solution and forms a volume of 100 cubic cm? Concentration= moles/volume. I found moles using mass/atomic mass of Na2+C+03. Then i used moles/volume to calculate concentration. Correct?
  14. K

    Mole Concept

    How many Gold atoms are in Gold mass of 2.5g? 15 percent of the mass is pure Gold. So first i found 15 percent of the mass which i used to calculate the number of moles. Then i multiplied the moles by Avogadros number to give me the atoms. Anyone help
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