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Sagot :
Answer
The percent by mass of hydrogen in aspirin, C9H8O4 = 4.44%
Explanation
What to find:
The percent by mass of hydrogen in aspirin, C9H8O4
Step-step-solution:
The first step is to determine the mass of hydrogen in aspirin.
From the periodic table, the atomic mass of H = 1.0 g
Since there are 8 atoms of H in aspirin, the mass of H in C9H8O4 will be
8 x 1.0 g = 8.0 grams
The next step is to determine the total mass of aspirin.
From the periodic table, the atomic masses: (H = 1.0, C = 12.0, O = 16.0)
Total mass of C9H8O4 = (9 x 12.0 g) + (8 x 1.0 g) + (4 x 16.0 g)
Total mass of C9H8O4 = 108.0 g + 8.0 g + 64.0 g
Total mass of C9H8O4 = 180.0 grams
The final step is to determine the percent 6by mass o hydrogen in aspirin, C9H8O using the formula below:4
[tex]\begin{gathered} Percentby\text{ }mass\text{ }of\text{ }hydrogen=\frac{Mass\text{ }of\text{ }hydrogen}{Total\text{ }mass\text{ }of\text{ }aspirin}\times100\% \\ \\ Percentby\text{ }mass\text{ }of\text{ }hydrogen=\frac{8.0\text{ }grams}{180.0\text{ }grams}\times100\% \\ \\ Percentby\text{ }mass\text{ }of\text{ }hydrogen=0.0444\times100\% \\ \\ Percentby\text{ }mass\text{ }of\text{ }hydrogen=4.44\% \end{gathered}[/tex]The percent by mass of hydrogen in aspirin, C9H8O4 = 4.44%
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