A solution of NaOH contains 20g of this compound in 2dm3 of this solution . What is molarity of this solution?

Answer 1

This sodium hydroxide solution has a molarity of 0,25.

Answer 2

20.0 what? Always use units.

Molarity = moles of solute/volume of solution

One can say with certainty that 495 grams of NaOH is;

495g/39.998g = 12.38 moles of NaOH

You need to find proper units for that volume.

Answer 3

The molar mass of NaOH is 40 g/mol (Na = 23 g/mol, O = 16 g/mol, H = 1 g/mol). Therefore, in 20g of NaOH, there are 0.5 mol (20g / 40 g/mol). The molarity is calculated by dividing the moles of solute by the volume of solution in liters, so in this case, the molarity is 0.25 mol/L (0.5 mol / 2 L).

Answer 4

The molarity is 1M