How many moles of H2 gas are generated when 4.0 moles of Na react? 2Na + 2H2O --> 2NaOH + H2

Consider the balanced equation below. pcl3+cl2-> pcl5 what is the mole ratio of pcl3 to pcl5

You are given the reaction cu + hno3> cu(no3)2 + no + h2o

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal