Question

20 gm. NaOH in 500 ml = ………….. ​

Answer 1

Answer:

Number of moles of NaOH = 20gm40gm/mol = 0.5 moles. Therefore, 20 gm NaOH dissolved in 500 ml of solution has 1M of molarity.

Answer 2

"molarity is 1M"

Explanation:

Given:

20 grams of NaOH

Volume = 500 ml

molarity:

molarity is the ratio of the moles of solute whose molarity is to be calculated and the volume of solvent used to dissolve the given solute.                        

                  M=number of moles / Volume of solvent in grams x 1000

number of moles = given weight of the substance / molar mass

                             = 20 / 40

                          n = 0.5 moles

Molarity =number of moles / Volume of solvent in ml x 1000

                = 0.5 / (500ml) x 1000

molarity =  1M

thus, molarity is 1M