I don't understand this I'm confused ​

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

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

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.