Determine the number of grams of substance present in 0.25mol of calcium trioxocarbonate iv(caco3)​

Determine the number o moles of ions/atoms/particle in the following: 2.50 miles of k2s (let me know how to do)

Calculate the mass of silver needed to react with chlorine to produce 126g if silver chloride?

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.