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How many equivalents of Mg would have to...

How many equivalents of Mg would have to react in order to liberate `4 N_(A)` electrons ? `(Mg-2e^(-)rarrMg^(2+))`

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Knowledge Check

  • The energy equivalent of 2.0 mg mass defect is

    A
    `1.8 xx 10^4` erg
    B
    `9xx 10^(-19)` erg
    C
    `1.5 xx 10^20` erg
    D
    `1.8 xx 10^18` erg

  • In the reaction 3 Mg+N_(2) rarr Mg_(3)N_(2)

    A
    Magnesium is reduced
    B
    Magnesium is oxidized
    C
    Nitrogen is oxidized
    D
    None of these

  • How many kg are there in 5.2 mg?

    A
    `5.2xx10^(-3)kg`
    B
    `5.2xx10^(-6)kg`
    C
    `5.2xx10^(-5)kg`
    D
    `5.2xx10^(-9)kg`

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    1.2g of Mg atoms in vapour phase absorb 50.0 kJ of energy to convert Mg atoms into Mg ions. The energy absorbed is needed for the following changes : Mg(g) rarr Mg^(+) (g) + e^(-) , DeltaH =750 kJ mol^(-1) Mg^(+)(g) rarrMg^(2+) (g) + e^(-) , Delta H = 1450 kJ mol^(-1) Calculate the percentage of Mg^(+) and Mg^(2+) ions in the final mixture.

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