JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Atomic Molecular and Equivalent masses

  • question_answer What volume of \[N{{H}_{3}}\]gas at STP would be needed to prepare 100ml of 2.5 molal (2.5m) ammonium hydroxide solution

    A)                 0.056 litres            

    B)                 0.56 litres

    C)                 5.6 litres

    D)                 11.2 litres

    Correct Answer: C

    Solution :

               2.5 molal \[N{{H}_{4}}OH\] means 2.5 moles of \[N{{H}_{3}}\] in   1000g \[{{H}_{2}}O\] (1000cc of solution)                    Hence, 100cc solution of \[N{{H}_{3}}\]requires = 0.25 mole                                 \[=0.25\times 22.4L=5.6L\].

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