Question

1. ____ Fe2O3 + ____ C → ____ Fe + ____ CO 
2. Balance the equation.
3. How many grams of carbon are needed to completely react with 125 g iron (III) oxide?

Answer 1

Ans:-

Balanced chemical reaction is

$2Fe_2O_3+6C \rightarrow 4Fe+6CO$

Moles of $Fe_2O_3=$ $\dfrac{Given mass}{molecular mass}$

$=$ $\dfrac{125}{159.69}$

$=$$0.782$ $mol$

According to stoichiometry,

2 moles of $Fe_2O_3$ completely react with 6 moles of C

$1$ mole of $Fe_2O_3=3$ moles of Carbon

so moles of Carbon that completely react$=3\times0.782=2.346 mol$

therefore the mass of carbon that needed to completely react $Fe_2O_3=$ $2.346\times12$

$=28.152 gm$