A. You have a stock solution of 15.6 M NH3. How many milliliters of this solution should you dilute to make 1350 mL of 0.220 M NH3? Express your answer using three significant figures. B. If you take a 10.0-mL portion of the stock solution and dilute it to a total volume of 0.550 L, what will be the concentration of the final solution? Express your answer using three significant figures

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.

In 2002, the rare earth elements mine in mountain pass, california was closed because

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?