Question

What is the percent by mass of hydrogen in aspirin (c9h8o4)?

Answer 1

Answer:The percent by mass of hydrogen in aspirin is 44.4%.

Explanation:

The molar mass of the Aspirin ,$C_9H_8O_4$:

$9\times 12 u+8\times 1 u+4\times 16 u= 180 u$

Mass of hydrogen present in one formula unit of Aspirin: $8\times 1 u=8 u$

$\text{mass percentage of hydrogen}=\frac{\text{total mass of hydrogen in Aspirin}}{\text{Molar mass of the Aspirin}}\times 100$

$\text{mass percentage of hydrogen}=\frac{8 u}{180 u}\times 100=4.44\%$

The percent by mass of hydrogen in aspirin is 44.4%.

Answer 2

Calculate the Mr of aspirin, next workout the percentage of H/aspirin