You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Electron Affinity

A chemist has...

Question

A chemist has one mole of X-atoms. He finds that on absorption of 410 kJ, half of X-atoms transfer one electron to the other half. If all the resulting $X^{-}$ ions are subsequently converted to $X^{+}$ ions, an addition of 735 kJ is required. The magnitude of electron affinity of X is.

Open in App

Solution

$\frac{X}{2} \to \frac{X^{+}}{2} + e^{-} \frac{1}{2} I . E .$ ...(i)
$e^{-} + \frac{X}{2} \to \frac{X^{-}}{2} \frac{1}{2} E . A . (- v e)$ ...(ii)
(i) + (ii)
$X \to \frac{1}{2} X^{+} + \frac{1}{2} X^{-} \frac{1}{2} (I . E . + E . A .) = 410 k J$
$I . E . + E . A . = 820 k J$
Now $\frac{1}{2} X^{-} \to \frac{1}{2} X^{+} + 2 e^{-}$ ...(iii) $△ H = 735 k J$
Now equaiton (iii) can be achieved by (i) + reverse (ii) and we will get
$\frac{1}{2} I . E . - \frac{1}{2} E . A . = 735$
$I . E . - E . A . = 1470$ ...(iv)
$2 E . A . = - 650$
E.A. = -325 kJ/mol.

Suggest Corrections

Similar questions

Q. A chemist has one mole of X-atom. He finds that on absorption of 410kJ, half of X-atoms transfer one electron to the other half. If all the resulting

x^{-}

ions are subsequently converted to

x^{+}

ions, an addition of 735 kJ is required. Find the electron affinity of X.

Q. There are 1 mole of atoms of an element A. When half of the atoms transfer one electron to another atom, 405

k J m o l^{- 1}

of energy was found to be consumed. An additional energy of 745

k J / m o l

was further required to convert all the

A^{-}

ions to

A^{+}

. Calculate the ionisation energy of atom A in

k J

Q. You are given Avogadro's no. atoms of

X

. If half of the atoms of

X

transfer one electron to the other half of

X

atoms,

409 k J

must be added. If these

X^{-}

, an additional

733 k J

energy must be added. If

I E

and

E A

are

a

and

b

X

. Find

a + b

(nearest integer value) in

e V

. Use (

1 e V = 1.602 \times 10^{- 19} J

and

N = 6.023 \times 10^{23}

)

In a mixture of

H - H e^{+}

gas, H atom and

H e^{+}

ions are excited to their respective first excited states. Subsequently, H atoms transfer its excitation energy to

H e^{+}

ions by collision.

If the Bohr model of an atom is applicable then the ratio of the potential energy of the n = 2 electrons for H atom to the He

^{+}

ion is:

If one electron has been removed from an atom, it becomes increasingly difficult to remove the second and subsequent electrons from the resulting positively charged ions on account of electrostatic attraction between the nucleus and the remaining electrons. If the ionization values of elements are plotted against the atomic number, then peaks are occupied by:

Join BYJU'S Learning Program

Explore more

Electron Affinity

Standard XII Chemistry

Join BYJU'S Learning Program

A chemist has one mole of X-atoms. He finds that on absorption of 410 kJ, half of X-atoms transfer one electron to the other half. If all the resulting X− ions are subsequently converted to X+ ions, an addition of 735 kJ is required. The magnitude of electron affinity of X is.

A chemist has one mole of X-atoms. He finds that on absorption of 410 kJ, half of X-atoms transfer one electron to the other half. If all the resulting $X^{-}$ ions are subsequently converted to $X^{+}$ ions, an addition of 735 kJ is required. The magnitude of electron affinity of X is.