in the combustion reaction 2C2H6+7O2>4CO2+6H2O ethane gas reacts with oxygen to produce carbon dioxide and steam. If 18.6 grams of C2H6 reacts O2, how many moles of steam does it produce

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.