Express the measurement using the appropriate SI prefix. 2.50 x 10-3g

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

How many atoms are there in 5.70 mol of mg

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.