$17 \mathrm{kg}$ of aluminium was produced from $51 \mathrm{kg}$ of aluminium oxide $\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$ by electrolysis. What was the percentage yield? $\left[{\mathrm{A}}_{\mathrm{r}}: \mathrm{Al}= 27, \mathrm{O}=16\right]$

Iron is formed by reducing iron (III) oxide using the gas carbon monoxide. The reaction is:

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• Write a word equation for the reaction.

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• What is the formula mass of iron (IlI) oxide? $\left({\mathrm{A}}_{\mathrm{r}}: \mathrm{Fe}=56, \mathrm{O}=16\right)$

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• How many moles of ${\mathrm{Fe}}_2{\mathrm{O}}_3$ are there in $320 \mathrm{Kg}$ of iron (IIl)oxide? $\left(1 \mathrm{Kg}=1000\mathrm{g}\right)$

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• How many moles of $\mathrm{Fe}$ are obtained from $1$ mole of ${\mathrm{Fe}}_2{\mathrm{O}}_3$?

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• Find how many moles of iron atoms are obtained from $320 \mathrm{Kg}$ of iron (III) oxide.

${\mathrm{Fe}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)+3\mathrm{CO}\left(\mathrm{g}\right)\to 2\mathrm{Fe}\left(\mathrm{s}\right)+3{\mathrm{CO}}_2\left(\mathrm{g}\right)$

• How much iron is obtained (in $\mathrm{Kg}$) from $320 \mathrm{Kg}$ of iron (III) oxide.