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JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry

\(Na _{2} SO _{4}\) के विलयन में \(Na ^{+}\) आयनों का भार \(92\, g\) है। तब जल के प्रति \(kg\) में \(Na ^{+}\) की मोललता ज्ञात कीजिए ?

  1. A \(12\)
  2. B \(4\)
  3. C \(8\)
  4. D \(16\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(8\)

Step-by-step Solution

Detailed explanation

Molality of \(N{a^ + } = \left( {\frac{w}{M} \times \frac{{1000}}{w}} \right) \times 2\) (\(Na_2SO_4\) contains two \(Na^+\) ions) \( = \left[ {\left( {\frac{{92}}{{23}} \times \frac{{1000}}{{1000}}} \right)} \right] \times 2 = 8\)
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