Question

Using the equation, 4Fe + 3O2 Imported Asset 2Fe2O3, if 111.6 g of iron react, what mass of oxygen was consumed?

32.0 g

48.0 g

96.0 g

111.6 g

Answer 1

Youll need a periodic table to get the masses

Answer 2

Answer: 48.0 g

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number
`6.023* 10^(23)` of particles.

To calculate the number of moles, we use the equation:

`\text{Number of moles of}Fe=\frac{\text{Given mass}}{\text{Molar mass}}=(111.6g)/(55.85g/mol)=2moles`

`4Fe+3O_2\rightarrow 2Fe_2O_3`

According to stoichiometry:

4 moles of iron react with 3 moles of oxygen

thus 2 moles of iron will react with =
`(3)/(4)* 2=1.5` moles of oxygen

Mass of oxygen=
`moles* {\text {molar mass}}=1.5* 32g/mol=48g`

Thus 48 g of oxygen were consumed.