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allsm [11]
3 years ago
10

A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the followi

ng hydrocarbon: C 7 H 16 .
Enter the percentages of carbon and hydrogen numerically to four significant figures, separated by commas.
Chemistry
1 answer:
Katena32 [7]3 years ago
7 0
C7H16, where C=12.01, and H=1.01, so the weight of the molecule would be 7(12.01)+16(1.01), or 100.23. The percentage of carbon would be found by ((7*12.01)/100.23)*100=83.88% Carbon
((16*1.01)/100.23)*100=16.12% Hydrogen
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Answer:

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Answer:

<u><em></em></u>

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Explanation:

<em>The most relevant question to ask regarding this change</em> must take into account the physical knowledge about matter.

When matter changes from<em> liquid </em>state to <em>gaseous</em> state, a physical change called evaporation, the particles (molecules or atoms) of the <em>pure substance </em>will separate from each other, take up more space and move faster.

<em>Condensation</em> is the opposite to evaporation, thus the option A) is not the most relevant question.

<em>The charge of the particles</em> does not change; so the option B) is not relevant at all.

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Answer:

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According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

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All other options are incorrect because mass is not conserved.

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