Brass is an alloy of​

Which metal exist in liquid state and can be cut with knife ?

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?

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.