Question

find molality of 6% w/v urea solution? ​

Answer 1

Answer:

6%(w/v) urea solution

6 g is present in 100 ml of water

60 g is present in 1000 ml of water or 1 litre

Molar mass of urea is 60 g

That means 1 mole of urea is present in 1 litre of solution so molarity of urea solution is 1M

M

1

=1M

M

2

=0.1M

V

1

=10mL

M

1

V

1

=M

2

V

2

V

2

=

0.1

10

=100 mL

Volume added to make 100 mL solution=100−10=90 mL