Please help (i know this is a lot but it makes no sense)

21. consider the following chemical reaction: n2+ o2 2 no if 10.0 g of n2 reacts with excess oxygen then how many grams of no can be formed? a) 10.7 g b) 21.4 g c) 32.9 g d) 42.8 g page 4 of 8

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Which description best characterization the motion of particles in a solid