Question

A ammonia solution has a density of 0.910 and 25.0% of NH3 by mass What is the molarity of the solution?​

Answer 1

Answer:

density =0.910 ,molarity=13.4

thanks...

Answer 2

Answer:

$\bigstar{\bold{Molarity=14.7\:M}}$

Explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Density of ammonia solution = 0.910
• Mass of NH₃ = 25 g
• Total mass of solution = 100 g

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Molarity of the solution

$\Large{\underline{\underline{\bf{Solution:}}}}$

→ First we have to find volume of the solution

→ We know that

  Density = Mass/Volume

  Volume = Mass/Density

→ Substituting the datas we get,

  Volume = 100/0.910

  Volume = 109.89 ml

  Volume = 0.10 L

→ Now we have to find number of moles of NH₃

→Number of moles = Given mass/Molar mass

→ Substituting the datas we get,

  Number of moles = 25/14+3

  Number of moles = 25/17

  Number of moles = 1.47 moles

→ Molarity is given by the equation,

 Molarity = Number of moles of solute/Volume of solution in L

→ Substitute the datas,

  Molarity = 1.47/0.1

  Molarity = 14.7 M

$\boxed{\bold{Molarity=14.7\:M}}$

$\Large{\underline{\underline{\bf{Notes:}}}}$

→ Number of moles is given by,

  Number of moles = Given mass/Molar mass

→ Molarity is given by

  Molarity = number of moles of solute/Volume of solution in L

→ Molality is given by

  Molality = number of moles of solute/Mass of solvent in kg