Question

If you have 110.0 grams of an unknown compound that contains 12.3 grams of hydrogen, what is the percent by mass of hydrogen in the compound

Answer 1

All you have to do is a simple division "parts over the whole"

12.3 grams H/ 110 grams compound x 100= 11.2%

Answer 2

Answer : The percent by mass of hydrogen in the compound is, 11.18 %

Explanation : Given,

Mass of unknown compound = 110.0 g

Mass of hydrogen = 12.3 g

Now we have to calculate the percent by mass of hydrogen in the compound.

$\text{Mass percent of hydrogen}=\frac{\text{Mass of hydrogen}}{\text{Total mass of unknown compound}}\times 100$

Now put all the given values in this formula, we get:

$\text{Mass percent of hydrogen}=\frac{12.3g}{110g}\times 100$

$\text{Mass percent of hydrogen}=11.18\%$

Therefore, the percent by mass of hydrogen in the compound is, 11.18 %