Question

20g of NaoH is dissolved in 200ml of solution calculate molarity

Answer 1

Answer:

2.5

Explanation:

Molarity= (no.of moles of solute)/volume×1000

• given mass of NAOH=20gm
• molar mass of NAOH=40gm

• no.of moles=20/40
• =.5mole
• M=.5/200 ×1000
• M=2.5M

Answer 2

Answer:

2.5moldm^-3

Explanation:

molarity is no.of solute moles which dissolve in 1 dm^-3 volume of solution

      so first of all we should find no.of mols of NaOH in 20g

         Na=23

         O  =16

         H   =1  add them up then we get 40 that is the molar mass of NaOH

     so tht means 40g per 1 mol if so in 20 g we have half of moles that is 0.5mols

       and now as i told earlier molarity=n/v

    so 0.5should divide by 200/1000 then its 0.5*1000/200

  then the final answer is 2.5moldm

HOPE YOU CAN UNDERSTAND

ALL THE BEST AND WORK HARD