PLZ HELP DUE IN 20 MINS

just need help with the first calculation and then I can finish but IDK how to get the partial pressure

The difference between the atomic number of an element and the element’s atomic mass is the number of ions.

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

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules