What is a chemical formula

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

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.

How does the motion of particles in a gas change as the gas cools