A20.0 ml sample of a nacl solution has a mass of 21.040 g. after the solution is evaporated to dryness, the dry salt residue has a mass of 4.348 g. calculate the following concentrations for the nacl solution.
a) mass/mass%
b) mass/volume%
c) molarity (m)

[ou.03jthe pictures below show the wavelengths and intensities of electromagnetic radiations emitted by three stars, star 1, star 2, and star 3. intensity intensity- intensity- 1000 3500 6000 8500 11000 wavelength (a) star 1 1000 3500 6000 8500 11000 1000 3500 6000 8500 11000 wavelength (a) wavelength (a) star 2 star 3 which of these statements is correct about the color of the three stars? star 2 is white in color o star 2 is yellow in color star 1 and star 3 are yellow in color star 1 and star 3 are white in color