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यदि NaCI को `SrCI_2` के `10^(-3)` मोल % से डोपित किया जाये तो धनायनों की रिक्तियों का सांद्रण क्या होगा?

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NaCl को `10^(-3)` mol% `SrCl_2` में डोपित किया गया है ।
`:. NaCl` के 100 mol `SrCl_2` के `10^(-3)` में डोपित हैं ।
`:. NaCl` का 1 मोल डोपित होगा `= (10^(-3))/(100)mol = SrCl_2` के `10^(-5)mol` में
प्रत्येक `Sr^(2+)` आयन धनायन रिक्तिका जनित करता है।
धनायन रिक्तियों की संख्या `=10^(-5)" mol/mol NaCl"`
`=10^(-5)xx 6.023 xx 10^23 mol^(-1)`
`= 6.023 xx 10^18 mol^(-1)`

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