Question

calculate the molarity and mole fraction of the solution of 117g of salt (MM=58.5g) dissolved in 5000g of water.

Answer 1

Answer:

Explanation:

                 $molarity=\frac{no.of moles}{volume of solution}$

no. of moles of salt = 117/58.5

                      =2

no. of moles of water= 5000/18

                                  =277.78

volume = mass/density

            = 5000/1 (g/ml)

            = 5000ml

           = 5L

molarity=2/5 = 0.4M

mole fraction

total no of moles=279.78

$mole fraction = \frac{no. of moles of compononet A}{total no. of moles of A+ B}$

a)Salt

mole fraction=2/279.78  = 0.00714

b)water

mole fraction=1-0.00714

                     =0.99286