5 Marcus has added 50g of sodium chloride in 100g of water. The solubility of sodium chloride is? option
5g/100g
50g/100g
500g/10g
50g/10g

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.

Is 9 correct? and can someone me with 10? it’s due tomorrow, you

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false