Question

One kilogram ofwater contains 4g of NaOH. The
concentration of the solution is best expressed
as:
a) 0.1 molal
c) decinormal
b) 0.1 molar
d) about 0.1 mole​

Answer 1

Answer:

concentration is 0.4%

Explanation:

Hello Mate!

1 kg = 1000 g.

So, 4 g of NaOH is dissolved in 1000 gof H2O.

Concentration of solution = wight of solute / weight if solution × 100%

Weight of solution = weight of solute + weight of solvent

= ( 4 + 1000 ) g

= 1004 g

So, concentration = 4/1004 × 100

= 0.4%

Hence concentration is 0.4%

Answer 2

Moles of the NaOH will be 40/4 =0.1

Molality = 0.1/1

a ) 0.1 molal