Molar conversation, how do i convert this into moles?

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?

How many miles of water are produced if 5.43 mol pbo2 are consumed

Ineed to find the answer of this question because i dont understand it