How can I find the number of moles of carbon?

Question

How many moles of carbon atoms are in 4.56g of CH3CH2OH? Do I just count up how many carbons are in the formula?

Answer 1

According to that chemical formula, there are 2 moles of Carbon for every molecule of CH3CH2OH. One mole of Carbon is 12.01 grams. You also have 6 moles of Hydrogen at 1.008 grams per mole and 1 mole of Oxygen at 16.0 grams per mole.

Therefore, 1 molecule of that compound contains 46.068 grams (2*12.01 + 6*1.008 + 1*16.0)

But you have 4.56 grams of this compound:

[4.56 grams] * [1 molecule / 46.068 grams] * [2 moles of Carbon / molecule]

=

0.198 moles of Carbon

QED (quite easily done)

Answer 2

A bit, yeah ;D The answer to this question is very simple. As you have 78g of benzene, which has a molecular mass of 78 g/mol, that means there is 1 mole of benzene molecules in 78grams of benzene So, as there are 6 carbon atoms in every molecule of benzene, there are 6 moles of carbon atoms in 78g of benzene NOTE: you only need the amount of mole of carbon in this case. ONLY if the number of carbon atoms was needed would you multiply the number of moles by avagadro's number (6.02 x 10^23)

Answer 3

hello

well firstly, the relative atomic mass of carbon (Ar) is 12

now use this formula:

Number of moles = Mass / Mr
Note that Mr is the relative molecular weight of a compound and that you obtain it by adding the Ar s of the elements constituting the compound. However since you are only concerned with carbon here so no need to calculate Mr of ethanol (CH3CH2OH)
use carbon's Ar only

So,
Number of moles of carbon = Mass of ethanol / Ar of carbon
= 4.56 / 12
= 0.38 moles of carbon

Hope it helps and good luck

Answer 4

You need to find the number of moles of the compound that you have. The molar mass of ethanol is 46, so you have approximately 0.1 moles of ethanol. Given that there are 2 carbons in the formula, it's roughly 0.2 moles of carbon atoms.

Answer 5

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Answer 6

First, always determine how many moles you have:

moles = grams/MW

in this case:

moles of ethanol = 4.56 g / 46 g/mol

= 0.1 mol of ethanol

there are 3 moles of carbon atoms in each mole of ethanol,

3 mol C / 1 mol ethanol x 0.1 mol ethanol

= 0.3 moles of Carbon atoms.

Notice how all the units cancel, except for the units in the answer.

Answer 7

No. You need to find what the mass of a mol of Carbon is, what the mass of a mol of H2 is what the mass of a mol of O2 is then you can count the Cs the Hs and the Os to find the number of Cs H2s and O2s to get the mass of a mol of CH3CH2OH (You don't need to worry about the mass of the chemical energy and probably don't have to even worry about the likely isotopic ratios).

Best of Luck - Mike

Answer 8

Molecular Weight Of Ch3ch2oh

Answer 9

you have to find the total molecular weight of the entire substance and then devide twice the molecular weight of the carbon atoms by the total molecular weight of the entire substance... this will give you the ratio of the weight of the substance compared to the whole (a percentage) then you times 4.56 by that percentage and it will give you how many grams of carbon are in that much of the substance... then you devide that number by the molecular weight of carbon and you will get the number of carbon atoms.