Question

What is the percent by mass of hydrogen in aspirin C9 H8 O4?

Answer 1

The percent by mass of hydrogen in aspirin, C9H8O4 = 4.44%

Step-by-step 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

`\begin{gathered} Percentby\text{ }mass\text{ }of\text{ }hydrogen=\frac{Mass\text{ }of\text{ }hydrogen}{Total\text{ }mass\text{ }of\text{ }aspirin}*100\% \\ \\ Percentby\text{ }mass\text{ }of\text{ }hydrogen=\frac{8.0\text{ }grams}{180.0\text{ }grams}*100\% \\ \\ Percentby\text{ }mass\text{ }of\text{ }hydrogen=0.0444*100\% \\ \\ Percentby\text{ }mass\text{ }of\text{ }hydrogen=4.44\% \end{gathered}`

The percent by mass of hydrogen in aspirin, C9H8O4 = 4.44%