Question

Mia has a 32.0 g sample of Fe(OH)3 for the investigation purpose. How many grams of oxygen be recovered from the sample?3.6 g21.6 g7.2 g14.4 g

Answer 1

INFORMATION:

We know that:

- Mia has a 32.0 g sample of Fe(OH)3 for the investigation purpose.

And we must find how many grams of oxygen are recovered from the sample

STEP BY STEP EXPLANATION:

To find the amount of gram of oxygen, we must:

1. Calculate the percent of oxygen in compound

- Find the molar mass of the compound

`\begin{gathered} 1mol\text{ }Fe=1*55.85(g)/(mol)=55.85(g)/(mol) \\ 3mol\text{ }O=3*16.00(g)/(mol)=48.00(g)/(mol) \\ 3mol\text{ }H=3*1.008(g)/(mol)=3.024(g)/(mol) \\ Molar\text{ }mass\text{ }Fe(OH)_3=106.87(g)/(mol) \end{gathered}`

- To find the percent by mass, divide the part by the whole and multiplying by 100.

`\frac{48.00g\text{ }O}{106.87\text{ }Fe(OH)_3}*100\%=44.91\%`

2. Multiply the starting mass by the percent of the desired element.

`32.0g\text{ }Fe(OH)_3*0.4491=14.4g\text{ }O`

Finally, 14.4 g of oxygen are recovered from the sample.

ANSWER:

14.4 g