Laboratory analysis shows that a compound consists of 40% Ti and 60% Cl by mass. What is the empirical formula of this compound?

What is the h+ concentration for an aqueous solution with poh = 4.01 at 25 ∘c? express your answer to two significant figures and include the appropriate units.

If the mass of the products measured 120g what would the mass of the reactants a. 30g b. 60g c. 120g d. 240g

Can someone me with questions 12 and 13 plz.