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NEET2001ChemistrySome Basic Concepts of ChemistryActual

How many litres of ammonia gas at S.T.P. would be needed to prepare 100 ~mL of 2.5 M ammonium hydroxide solution?

Options

  1. A5.6 ~L
  2. B0.056 ~L
  3. C11.2 ~L
  4. D0.56 ~L

Correct answer

A. 5.6 ~L

Step-by-step solution

Molecular weight of NH ₄ OH =35 Now, 35 ~g of NH ₄ OH is needed to prepare 1 M solution in 1 litre 35 ~g NH ₄ OH in 1 ~L solution 1 molar solution 2.5 35 ~g NH ₄ OH in 1 ~L solution 2.5 molar solution aligned & 2.5 35 10 ~g NH ₄ OH is 100 ~mL solution 2.5 molar solution & 8.75 ~g NH ₄ OH was dissolved. & NH ₃+ H ₂ O NH ₄ OH & For 35 ~g NH ₄ OH , NH ₃ needed =22.4 ~L at S.T.P & for 8.75 ~g NH ₄ OH , NH ₃ needed = 22.4 35 8.75 ~L &=5.6 ~L aligned

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