How many grams of KOH are required to prepare 400 mL of a 0.350 M KOH solution?

Which of the following compounds produces the greatest number of moles of ions per mole of formula units when dissolved in water?

Given the reaction: CaC2 + 2 H2O → C2H2 + Ca(OH)2, how many grams of H2O are required to produce 13.0 g of C2H2?

In a stoichiometric reaction, what is the primary purpose of adding Na2CO3 to the reaction mixture?

2. Which of the following is the correct method to convert between moles of one substance and moles of another substance in a chemical reaction?

An iron bar weighing 56.0 g reacts completely with excess hydrochloric acid according to the equation: Fe + 2HCl → FeCl2 + H2. What mass of H2 is produced?

A solution contains 0.10 mol/L BaCl2. What is the minimum volume (in L) of 0.20 mol/L Na2SO4 solution that must be added to 100.0 mL of the BaCl2 solution to initiate the precipitation of BaSO4? Assume complete mixing and that BaSO4 begins to precipitate when the product of [Ba^{2+}] and [SO_4^{2-}] exceeds the K_{sp} of BaSO4 (K_{sp} = 1.1 imes 10^{-10}).

In the reaction between NaOH and H2SO4, how many moles of NaOH are required to completely react with 1 mole of H2SO4 according to the balanced chemical equation?

If 0.50 mol of Al reacts completely with excess H2SO4, how many moles of Al2(SO4)3 can be formed?