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To find the mass of carbon as a percent of the molecule, you have to first know the mass of the whole molecule. This can be done with the atomic weights of the elements and multiplying them by the number of atoms in a single molecule of hexachlorophene (the given compound).

Carbon: 12.0 g/mol × 13 = 156

Hydrogen: 1.0 g/mol × 6 = 6.0

Chlorine: 35.5 g/mol × 6 = 213

Oxygen: 16.0 g/mol × 2 = 32.0

C13H6Cl6O2 = 407 g/mol

(Mass of carbon ÷ total mass) × 100 = % carbon by mass

(156 ÷ 407) × 100 = 38.3% carbon

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13y ago
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5mo ago

To calculate the percent of carbon by mass in C4H10O, first determine the molar mass of the compound: C = 12.01 g/mol, H = 1.008 g/mol, O = 16.00 g/mol. The total molar mass of C4H10O is 74.12 g/mol. Then, calculate the mass contribution of carbon: 4(12.01 g/mol) / 74.12 g/mol = 0.648. Finally, convert this to a percentage by multiplying by 100% to get 64.8% carbon by mass.

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10y ago

First find the molar mass of C10H14N2 by multiplying the number of atoms of each element times its molar mass (atomic weight on the Periodic Table). Then add the molar masses of each element. The sum is the molar mass of the compound.

C: 10 x 12.011g/mol = 120.11g/mol

H: 14 x 1.008g/mol = 14.11g/mol

N: 2 x 14.007g/mol = 28.014g/mol

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Total = 162.23g/mol = molar mass of C10H14N2

Percent carbon by mass = mass of C/mass of C10H14N2 x 100 = (120.11g/mol)/(162.23g/mol) x 100 = 74.037% C by mass

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17y ago

See the Related Questions link to the left for the answer.

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11y ago

The molar mass of C4H10O is 74.12. So you divide carbon (48.04) by the molar mass (74.12) and then multiply by 100. (48.04/74.12 * 100 = 64.81)

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Q: What is the percent of carbon by mass in C4H10O?
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