Help with Grams of Carbon?

Question

The molecular formula for DEET is C12H17NO

How many grams of carbon can be obtained from 127g of DEET?

how do i do this? I think i use stoichiometry?

Answer 1

Yeah you need to find the reaction equation for this first. Then after stoichiometry compare moles.

1. Equation

2. Find the amount of moles deet you have

3. After stoichiometry figure out how many moles Carbon you can extract

4. Multiply that by 12 (for 12 grams/mol)

Answer 2

Get the molecular formula of DEET first.

MM DEET = [12(12.01) + 17(1.008) + 1(14.00) + 1(16.00)] g/mol

MM DEET = 191.30 g/mol

To get the percentage of carbon in DEET, divide the total molar mass of the all carbons present by the molar mass of DEET. Since there are 12 carbons present, and the MM of carbon is 12.01 g/mol, the percentage of carbon in DEET would be:

%Carbon = [12(12.01) / 191.30] g/mol x 100

%Carbon = 75.34 %

Therefore, 75.34% of DEET is carbon.

The total mass of carbon present in DEET can be obtained by multiplying the mass of DEET by the percentage of carbon (divided by 100).

Answer:

In 127 grams of DEET, there are (0.7534 x 127 g) of carbon; that is, 95.68 grams.

Answer 3

Molar mass of DEET is 191 g/mol. Of this, carbon is 144g/mol.

(144g/mol)/(191g/mol) = 75.4% carbon

(.7539267016)(127grams) = 95.8 grams of carbon

Answer 4

Cool, thats an easy one.  So, you have 127 grams of "DEET."  The molar mass of DEET is the mass of all its parts.  so 12 carbons, 17 Hydrogens, 1 Nitrogen, 1 Oxygen.  If i remember right, C is 12, H is 1, N is 14, and O is 12.  This adds up to 144+17+14+12= 187grams

Therefore the number of moles of DEET you have is 127/187 = .679 moles about.

New idea, actually.  Find the % composition of Carbon.  Carbon takes 144/187 grams which is 77%.  So it would make sense that Carbon makes up 77% of DEET.  So, you have 127 grams of DEET, you have .77 times 127 grams of Carbon =

97.8 grams of Carbon approx.