Determine the mass of 10% sulfuric acid required for the reaction with 20.8 g of barium chloride.

First, we draw up an equation, we find the amount of BaCl2 substance (we divide the mass by the molar mass of BaCl2), the amount of sulfuric acid substance is equal to the found amount of barium chloride substance (according to the reaction they react in a ratio of 1: 1), we find the mass of the sulfuric acid solute (we multiply the amount of substance by molar mass), since we are given a concentration, then we need to find the mass of the sulfuric acid solution, for this we divide the calculated mass by the concentration.