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tiny-mole [99]
3 years ago
5

Give the mass percent of carbon in C14H19NO2?

Chemistry
2 answers:
Pachacha [2.7K]3 years ago
7 0
72.0726 is the percent for carbon
denpristay [2]3 years ago
4 0

Answer:

The mass percent of carbon in C₁₄H₁₉NO₂ is 72.1%.

Explanation:

To calculate the mass percent of carbon in C₁₄H₁₉NO₂ we have to follow two simple steps:

1st) Look for the <u>atomic weight of each element</u> in the Periodic Table and then <u>multiply each one by its subscript</u> in the molecule and finally <u>sum all</u> of them to find the molar weight of the molecule:

  • Carbon atomic weight . Carbon subscript = 12 . 14 = 168g
  • Hydrogen atomic weight . Hydrogen subscript = 1 . 19 = 19g
  • Nitrogen atomic weight . Nitrogen subscript = 14 . 1 = 14g
  • Oxygen atomic weight . Oxygen subscript = 16 . 2 = 32g

The molar weight of C₁₄H₁₉NO₂ is: 168g + 19g + 14g +32g = 233g.

2nd) Find the mass percent of carbon with a <u>Rule of three</u>:

If 233g represents the 100% of mass, the 168g of carbon in the molecule will represents the 72.1% of mass.

The Rule of three is:

233g ------------- 100%

168g ------------- = (168 . 100)/233 = 72.1% mass of carbon.

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