How many molecules of SO2 gas would occupy 4.15 L at STP?

please help me :)

Compare and contrast physical changes with chemical changes.

An experimental procedure requires a 10 ml of acid to be dissolved

Consider the reaction: n2(g) + o2(g) ⇄ 2no(g) kc = 0.10 at 2000oc starting with initial concentrations of 0.040 mol/l of n2 and 0.040 mol/l of o2, calculate the equilibrium concentration of no in mol/l how would this be done?