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

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number

What is the number of neutrons in an atom with atomic mass of 35