0.5 g of salt is dissolved in 25 g of water. Calculate the percentage amount of salt in the solution.

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.

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.

How many moles of oxygen react with 12 moles of aluminum