qqp question1: How do I calculate the ΔH of Mg(s) + HCl(l) -> MgCl2(aq) + H2(g)? question2: How many milliliters of lemon juice do I need to totally dissolve the limescale in the first case 120 mg/l of calcium (multiplied) for 15 liters in the second case 440 mg/l of calcium (multiplied) for 15 liters?