How many molecules does 1.25 grams of C2H4 represent?

How many atoms are there in 5.70 mol of mg

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?

Which example is a mechanical wave?     a.microwave    b.radio wave    c.water wave    d.ultraviolet light