How many moles of dinitrogen tetroxide (N2O4) are in 6.49 x 109 particles? 1.08 x 10–14 mol N2O4

3.091 x 1033 mol N2O4

6.02 x 1023 mol N2O4

1.08 x 10–23 mol N2O4

Most smaller stars don't have a radiative zone.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

They are all solids.