Question

What volume of gas at stp would be needed to prepare 100ml of 2.5 molal (2.5m) ammonium hydroxide solution?

Answer 1

Answer in attached photo

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Answer 2

SOLUTION

$</u><u>M</u><u>olarity \: = \frac{no. \:of \: moles \: of \: solute}{volume \: of \: the \: \: solution \: in \: </u><u>L</u><u>}$

$= > 2.5 = \frac{number \: of \: moles}{0.1}$

No. of moles= 2.5× 0.1 = 0.25

1 mole of any gas occupies 22.4 L at STP

0.25 mole occupy = 22.4/2/1× 0.25

=) 5.6L

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