In 180 grams of Omega 15 percent solution, 20 grams of alkali were dissolved to find the total mass of the solution.

1) Find the mass of alkali in the original solution using the formula:

mass of solute = mass fraction of solute in solution * mass of solution: 100%.

Substitute the original values into the formula:

mass of alkali = 15% * 180g: 100% = 27 (g).

2) Find the new mass of the solution: 180 + 20 = 200 (g).

3) Find a new mass of alkali in solution: 27 + 20 = 47 (g).

4) Find the new concentration of the solution using the formula from point 1):

mass fraction of alkali in solution = 47: 200 * 100% = 23.5%.

Answer: the mass of the resulting solution will be 200 g.