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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.
 one year ago
 one year 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.
 one year ago
 one year ago

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abb0tBest ResponseYou've already chosen the best response.0
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.
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
ok so Carbon has .0745 mol and hydrogen has .1043 mol. now what do i do?
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
so would the units be g/mol?
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
Divide the mol given by 0.745 for both.
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
so not by the molecular mass?
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
No. That's for molecular formula. Sorry.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
like information to osrt of "check"
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
okay so i got 1 for carbon and 1.4 for hydrogen
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
ok, round to the closest whole number ratio and that's your empirical formula
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
okay so what about the molecular formula? and so the empirical formula would be just 1 and 1?
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
Find the total mass of your empirical formula and divide that total by your molecular mass found out.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
You should have: \[\frac{ 546.9g }{ 13.018g }\]
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
how did you get 13.018?
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
Well, your empirial formula give is CH. The total mass of C + H = 13.018 g/ mol
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
okay so the answer to 546.9g/13.018g is 42.01.
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
Yep, now multiply that number by your empirical formula to get your molecular formula.
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
so multiply 42.01 with 1 or 2?
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
what is the empirical formula though? 1 or 2?
 one year ago

TttaammmaannnaaBest ResponseYou've already chosen the best response.0
so its just 42.01..
 one year ago

abb0tBest ResponseYou've already chosen the best response.0
Use whole numbers. So 42.
 one year ago
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