Question

IE1 and IE2 of Mg are 740,1540kJ/mole calculate the percentage of Mg+and Mg+2 if one gram of Mg absorb 50kJof energy​

Answer 1

Given that,

Energy of Mg $E_{1}=740\ kJ/mole$

Energy of Mg $E_{2}=1540\ kJ/mole$

If one gram of Mg absorb 50 kJ of energy​.

We need to calculate the number of moles of Mg

Using formula of number of moles

$\text{number of moles of mg}=\dfrac{1}{\text{atomic mass of Mg}}$

Put the value into the formula

$\text{number of moles of mg}=\dfrac{1}{24}$

$\text{number of moles of mg}=0.0417$

Energy absorbed in the ionization of Mg to $Mg^{+}$

$E_{obs}=0.0417\times740$

$E_{obs}=30.83$

Energy unused is

$E=50-30.83= 19.17\ kJ$

19.17 kJ will be used in the ionization of $Mg^{+}(g)$ to $Mg^{+2}(g)$

We need to calculate the number of moles of $Mg^{+}(g)$ converted to $Mg^{+2}(g)$

$\text{Number of moles}=\dfrac{19.17}{1540}$

$\text{Number of moles}=0.0125$

We need to calculate the number of moles of $Mg^{+}(g)$ left $Mg^{+2}(g)$

$\text{Number of moles}=0.0417-0.0125$

$\text{Number of moles}=0.0292$

We need to calculate the percentage of $Mg^{+}$

Using formula for percentage

$Mg^{+}=\dfrac{0.0292}{0.0417}\times100$

$Mg^{+}=70.0\%$

We need to calculate the percentage of $Mg^{+2}$

Using formula for percentage

$Mg^{+}=\dfrac{0.0125}{0.0417}\times100$

$Mg^{+}=29.9\%$

Hence, The percentage of $Mg^{+}$ is 70.0%.

The percentage of $Mg^{+2}$ is 29.9%.

Answer 2

Answer:

Explanation:

Given that,

Energy of Mg

Energy of Mg

If one gram of Mg absorb 50 kJ of energy​.

We need to calculate the number of moles of Mg

Using formula of number of moles

Put the value into the formula

Energy absorbed in the ionization of Mg to

Energy unused is

19.17 kJ will be used in the ionization of  to

We need to calculate the number of moles of  converted to

We need to calculate the number of moles of  left

We need to calculate the percentage of

Using formula for percentage

We need to calculate the percentage of

Using formula for percentage

Hence, The percentage of  is 70.0%.

The percentage of  is 29.9%.

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