in this stoichiometry problem, determine the theoretical yield:

excess aqueous copper(ii) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(ii) sulfide as a precipitate. in this reaction 469 grams of copper(ii) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate.

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.