Question

how many grams of 40% pure Sodium Hydroxide is dissolved in 0.5 mole 250 ml and solution​

Answer 1

Answer:

12.5 gram is the correct answer.

Explanation:

Given data:

Percentage of pure Sodium Hydroxide= 40%

Number of moles = 0.5 mole

Concentration or volume = 250 ml

To find

grams of 40% pure Sodium Hydroxide is dissolved in 0.5 mole 250 ml and solution =?

Solution

Molar mass of sodium hydroxide = 40

Let the mass ​of sodium hydroxide be = x*40/100

=4x/10

Number of solute = total mass/molat mass

= (4x/10) /40

= 4x/400

=x/10

We know that

molarity =

moles of the solute/volume

0.5 = (x/100*250) /1000

0.5= 250000x/100

0.5=x/25

x= 25*0.5

=12.5

But x is the grams of 40% pure Sodium Hydroxide is dissolved in 0.5 mole 250 ml and solution.

Hence, 12.5 gram is the correct answer.

Answer 2

Answer:

12.5

Explanation:

this you answer