How many hydrogen ATOMS are needed to produce 2 water (H2O) molecules? HINT: ATOMS not molecules

Calculate the change in entropy if br2(l) is converted to br2(g). s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?