anonymous
  • anonymous
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.
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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abb0t
  • abb0t
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.
anonymous
  • anonymous
ok so Carbon has .0745 mol and hydrogen has .1043 mol. now what do i do?
anonymous
  • anonymous
so would the units be g/mol?

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abb0t
  • abb0t
Divide the mol given by 0.745 for both.
abb0t
  • abb0t
0.0745*
anonymous
  • anonymous
so not by the molecular mass?
abb0t
  • abb0t
No. That's for molecular formula. Sorry.
abb0t
  • abb0t
like information to osrt of "check"
anonymous
  • anonymous
okay so i got 1 for carbon and 1.4 for hydrogen
abb0t
  • abb0t
ok, round to the closest whole number ratio and that's your empirical formula
anonymous
  • anonymous
okay so what about the molecular formula? and so the empirical formula would be just 1 and 1?
abb0t
  • abb0t
Find the total mass of your empirical formula and divide that total by your molecular mass found out.
abb0t
  • abb0t
You should have: \[\frac{ 546.9g }{ 13.018g }\]
anonymous
  • anonymous
how did you get 13.018?
abb0t
  • abb0t
Well, your empirial formula give is CH. The total mass of C + H = 13.018 g/ mol
anonymous
  • anonymous
okay so the answer to 546.9g/13.018g is 42.01.
abb0t
  • abb0t
Yep, now multiply that number by your empirical formula to get your molecular formula.
anonymous
  • anonymous
so multiply 42.01 with 1 or 2?
abb0t
  • abb0t
42(empirical formula)
anonymous
  • anonymous
what is the empirical formula though? 1 or 2?
abb0t
  • abb0t
1!
anonymous
  • anonymous
so its just 42.01..
abb0t
  • abb0t
Use whole numbers. So 42.
anonymous
  • anonymous
so thats it?

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