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Calculate the percentage composition of ...

Calculate the percentage composition of
(i) iron in ferric oxide , `Fe_(2)O_(3)` (atomic mass of Fe = 56)
(ii) nitrogen in urea `H_(2)NCONH_(2)`

Text Solution

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(i) 70% (ii) 46.6 %
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Calculate the percentage composition of the following compounds: (i) Urea CO(NH_(2))_(2) (ii) Copper sulphate CuSO_(4).H_(2)O

Calculate the mass of iron which will be converted into the oxide (Fe_(3)O_(4)) by the action of 18 g of steam on it.

Knowledge Check

  • The oxidation number of iron in Fe_(3)O_(4) is

    A
    `+2`
    B
    `+3`
    C
    `8//3`
    D
    `2//3`

  • The oxidation number of iron in Fe_(3)O_(4) is

    A
    `+2`
    B
    `+3`
    C
    `8//3`
    D
    `2//3`

  • Number of Fe atoms in 100 g Haemoglobin if it contains 0.33% Fe. (Atomic mass of Fe. = 56)

    A
    ` 0.035 xx 10^(23)`
    B
    35
    C
    ` 3.5 xx 10^(23)`
    D
    `7 xx 10^(8)`

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    Calculate the mass of iron which will be converted into its oxide (Fe_(3)O_(4)) by the action of 18 g of steam on it.

    When iron is heated in oxygen, it forms ferroso ferric oxide (Fe_3O_4) .

    Iron and oxygen combine to form three oxides, FeO, Fe_(2)O_(3) and Fe_(3)O_(4) . Which law does it prove?

    The oxidation state of iron in [Fe(H_(2)O)_(5)NO]^(2+) is

    The composition of a sample of wustite is Fe_(0.93)O_(1.0) . What is the percentage of iron present as Fe^(3+) ?

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