Someone help me to these please i dont have much time

Why doesn't heat added to water make the tempature rise above 100c

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.

When the mercury level in a barometer decreases that atmospheric pressure has