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Nana76 [90]
3 years ago
11

Acetaminophen is the generic name of the pain reliever in Tylenol and some other headache remedies- The compoundhas the molecula

r formula C8H9N02. Compute, to four significant figures, the mass percentage of each of the fourelements in acetaminophen.
Chemistry
1 answer:
slega [8]3 years ago
6 0

<u>Answer:</u> The mass percentage of carbon element is 63.57 %, hydrogen element is 5.96 %, nitrogen element is 9.28 % and oxygen element is 21.19 %

<u>Explanation:</u>

We are given:

A chemical compound having chemical formula of C_8H_9NO_2. This compound is made by the combination of carbon, hydrogen, nitrogen and oxygen elements.

1 mole of acetaminophen contains 8 moles of carbon atom, 9 moles of hydrogen atom, 1 mole of nitrogen atom and 2 moles of oxygen atom

Mass of carbon element = (8\times 12)=96g/mol

Mass of hydrogen element = (9\times 1)=9g/mol

Mass of nitrogen element = (1\times 14)=14g/mol

Mass of oxygen element = (2\times 16)=32g/mol

Mass of the compound = 151 g/mol

To calculate the percentage composition of an element in a compound, we use the equation:

\%\text{ composition of an element}=\frac{\text{Mass of element}}{\text{Mass of compound}}\times 100      ........(1)

  • <u>For carbon element:</u>

Putting values in equation 1, we get:

\% \text{ composition of carbon element}=\frac{96}{151}\times 100\\\\\% \text{ composition of carbon element}=63.57\%

  • <u>For hydrogen element:</u>

Putting values in equation 1, we get:

\% \text{ composition of hydrogen element}=\frac{9}{151}\times 100\\\\\% \text{ composition of hydrogen element}=5.96\%

  • <u>For nitrogen element:</u>

Putting values in equation 1, we get:

\% \text{ composition of nitrogen element}=\frac{14}{151}\times 100\\\\\% \text{ composition of nitrogen element}=9.28\%

  • <u>For oxygen element:</u>

Putting values in equation 1, we get:

\% \text{ composition of oxygen element}=\frac{32}{151}\times 100\\\\\% \text{ composition of oxygen element}=21.19\%

Hence, the mass percentage of carbon element is 63.57 %, hydrogen element is 5.96 %, nitrogen element is 9.28 % and oxygen element is 21.19 %

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Answer:

11

∘

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Explanation:

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to liquid at

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The heat needed to melt the solid at its melting point will come from the warmer water sample. This means that you have

q

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100.0

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1 mole H

2

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18.015

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So, how much heat is needed to allow the sample to go from solid at

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to liquid at

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6.01

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(

1

)

becomes

33.36 kJ

+

q

2

=

−

q

3

The minus sign for

q

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is used because heat lost carries a negative sign.

So, if

T

f

is the final temperature of the water, you can say that

33.36 kJ

+

m

sample

⋅

c

⋅

Δ

T

sample

=

−

m

water

⋅

c

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Δ

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water

More specifically, you have

33.36 kJ

+

100.0

g

⋅

4.18

J

g

∘

C

⋅

(

T

f

−

0

)

∘

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−

650

g

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4.18

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C

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(

T

f

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33.36 kJ

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(

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=

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f

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0.418

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Change in temperature (ΔT) = 0.267°C

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Thus, the mass of present can be obtained as follow:

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6 0
3 years ago
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balu736 [363]

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