A sample of 254.2 grams of copper completely reacted with oxygen to form 286.2 grams of copper oxide product how many grams of oxygen reacted

How can you use chemical equations to predict the products of the reaction you can carry out?

Calcium chloride +gold(1) oxide—>

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?