How many grams of water are needed to add to 4.00 grams NaOH to create a 2.00% solution

The answer to your question is 200 g

Explanation:

Data

mass of water = ?

mass of NaOH = 4 g

concentration = 2 %

Formula

% mass = mass of solute/mass of solution x 100

-Solve for mass of solution

mass of solution = mass of solute / % mass x 100

-Substitution

mass of solution = 4 / 2 x 100

-Simplification

mass of solution = 2 x 100

-Result

mass of solution = 200 g