A sample of 4.25 moles of hydrogen at 20.0°C now occupies a volume of 25.0L under what atmosphere pressure is the sample under?

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

you need to stop taking that class