How many more h+ ions does a solution with a ph of 4 than a solution with a ph of 5?

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!