Question

Calculate the mass of chromium produced from 50g of Cr2O3.

Answer 1

Answer: 34 gram of chromium produced from 50g of
`Cr_2O_3`

Step-by-step explanation:

To calculate the moles :

`\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}`

`\text{Moles of} Cr_2O_3=(50g)/(152g/mol)=0.33moles`

The decomposition of
`Cr_2O_3` follows the equation :

`2Cr_2O_3\rightarrow 4Cr+3O_2`

According to stoichiometry :

2 moles of
`Cr_2O_3` produce = 4 moles of
`Cr`

Thus 0.33 moles of
`Cr_2O_3` will produce=
`(4)/(2)* 0.33=0.66moles` of
`Cr`

Mass of
`Cr=moles* {\text {Molar mass}}=0.66moles* 52g/mol=34g`

Thus 34 gram of chromium produced from 50g of
`Cr_2O_3`