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Tttaammmaannnaa

  • 2 years ago

4. Carotene, the pigment responsible for the color of carrots, has a percent composition of 89.49%--C and 10.51%--H. Its molecular mass was found to be 546.9g. Calculate its empirical formula and its molecular formula.

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  1. abb0t
    • 2 years ago
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    Assuming 100% composition you would take 0.8949g of carbon and 0.1051 g of hydrogen. You then take the molecular mass given to find moles.

  2. Tttaammmaannnaa
    • 2 years ago
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    ok so Carbon has .0745 mol and hydrogen has .1043 mol. now what do i do?

  3. Tttaammmaannnaa
    • 2 years ago
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    so would the units be g/mol?

  4. abb0t
    • 2 years ago
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    Divide the mol given by 0.745 for both.

  5. abb0t
    • 2 years ago
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    0.0745*

  6. Tttaammmaannnaa
    • 2 years ago
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    so not by the molecular mass?

  7. abb0t
    • 2 years ago
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    No. That's for molecular formula. Sorry.

  8. abb0t
    • 2 years ago
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    like information to osrt of "check"

  9. Tttaammmaannnaa
    • 2 years ago
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    okay so i got 1 for carbon and 1.4 for hydrogen

  10. abb0t
    • 2 years ago
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    ok, round to the closest whole number ratio and that's your empirical formula

  11. Tttaammmaannnaa
    • 2 years ago
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    okay so what about the molecular formula? and so the empirical formula would be just 1 and 1?

  12. abb0t
    • 2 years ago
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    Find the total mass of your empirical formula and divide that total by your molecular mass found out.

  13. abb0t
    • 2 years ago
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    You should have: \[\frac{ 546.9g }{ 13.018g }\]

  14. Tttaammmaannnaa
    • 2 years ago
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    how did you get 13.018?

  15. abb0t
    • 2 years ago
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    Well, your empirial formula give is CH. The total mass of C + H = 13.018 g/ mol

  16. Tttaammmaannnaa
    • 2 years ago
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    okay so the answer to 546.9g/13.018g is 42.01.

  17. abb0t
    • 2 years ago
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    Yep, now multiply that number by your empirical formula to get your molecular formula.

  18. Tttaammmaannnaa
    • 2 years ago
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    so multiply 42.01 with 1 or 2?

  19. abb0t
    • 2 years ago
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    42(empirical formula)

  20. Tttaammmaannnaa
    • 2 years ago
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    what is the empirical formula though? 1 or 2?

  21. abb0t
    • 2 years ago
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    1!

  22. Tttaammmaannnaa
    • 2 years ago
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    so its just 42.01..

  23. abb0t
    • 2 years ago
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    Use whole numbers. So 42.

  24. Tttaammmaannnaa
    • 2 years ago
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    so thats it?

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