A mixture of hydrogen and nitrogen gases is present in a container. The partial pressure of the hydrogen is 21 kPa, while the partial pressure of the nitrogen is 67 kPa. The total gas pressure in the container is . a. 101 kPa
b. 88 kPa
c. 44 kPa
please help :

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.