Which of the following accurately represents the number of those in the agriculture field who make their living farming?

What is the number of moles of chemical units represented by 9.03x10^24? and how do i show work? (dumb it down )

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

Balance the following reaction. as2s3 + 9o2 → 2as2o3 + so2