Why is atmospheric pressure much lower on the top of a mountain than it is as sea level?

Agas has a volume of 0.7 l at 300 mmhg. what would be the new volume at 900 mmhg

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.