Most of an atom's volume is the space in which electrons move true or false

If 34.2 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 299 kelvin and 1.21 atmospheres? 2 li (s) + 2 h2o (l) yields 2 lioh (aq) + h2 (g)

Stage in which a typical star has completely stopped fusion

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