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Weight of oxygen in Fe(2)O(3) and FeO is...

Weight of oxygen in `Fe_(2)O_(3)` and `FeO` is in the simple ratio of:

A

`1:3`

B

`1:2`

C

`3:1`

D

`2:1`

Text Solution

Verified by Experts

The correct Answer is:
3
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The standard enthalpy of formation of FeO and Fe_(2)O_(3) is -65kcal mol^(-1) and -197kcal mol^(-1) respectively. A mixture of two oxides contains FeO and Fe_(2)O_(3) in the mole ratio 2:1 . If by oxidation, it is changed into a 1:2 mole ratio mixture, how much of thermal energy will be released per mole of initial mixture ?

A certain mixed oxide of iron contains 2.5 grams of oxygen for every 7.0 grams of iron. If it is regarded as a mixture of FeO and Fe_(2)O_(3) in the weight ratio a : b, what is a : b, (atomic weight of iron = 56)

Knowledge Check

  • Weight of oxygen in Fe_(2)O_(3) and FeO in the simple ratio for the same amount of iron is:

    A
    `1:2`
    B
    `2:1`
    C
    `3:2`
    D
    `1:3

  • Equivalent weight of iron in Fe_(2)O_(3) would be

    A
    28
    B
    56
    C
    `18.6`
    D
    112

  • The standerd enthalpy of formation of FeO and Fe_(2)O_(3) is -65 kcal "mole"^(-1) and -197 " kcal" " mole"^(-1) respectively . A mixture of two oxides containes FeO and Fe_(2)O_(3) in the mole ratio 2 : 1 . If by oxidation, it is changed into a 1 : 2 mole ratio mixture , How much of thermal energy will released per mole of the internal mixture ?

    A
    13.4 kcal`//`mole
    B
    14.6 kcal`//`mole
    C
    15.7 kcal`//`mole
    D
    16.8 kcal`//` mole

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