PLEASE HELP! this is due soon!!

Acompound has a molar mass of 92.02 grams/mole, and its percent composition is 30.4% nitrogen (n) and 69.6% oxygen (o). what is its molecular formula? a. n2o4 b. no2 c. n2o d. n4o2

How can carbon move from "land" to bodies of water? describe the way human impact has lead to increased levels of co2 in the atmosphere.

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these